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The Anzio and Nettuno beachheads are located at the northwestern end of a tract of reclaimed marshland, formerly the Pontine Marshes, now the Pontine Fields (Agro Pontino). Previously uninhabited and uninhabitable due to mosquitoes carrying malaria, Roman armies marched as quickly as possible across it on the military road, the Via Appia. The marsh was bounded on one side by the sea and on others by mountains: the Monti Albani, the Monti Lepini, the Monti Ausoni and further south the Monti Aurunci (where the allies had been brought to a halt before Monte Cassino). Overall these mountains are referenced by the name Monti Laziali, the mountains of Lazio, the ancient Latium. Invading armies from the south had the choice of crossing the marsh or to take the only other road to Rome, the Via Latina, running along the eastern flanks of the Monti Laziali, risking entrapment, as had been a Roman army at the Battle of the Caudine Forks in 321BC. The marshes were turned into cultivatable land in the 1930s under the command of the dictator, Benito Mussolini. Canals (over which the battle was fought) and pumping stations were built to remove the brackish water from the land which divided it into personal tracts with new stone houses for colonists from north Italy. Mussolini also founded the five cities destroyed by the battle.
When General Truscott's 3rd Division was first selected for the operation, he pointed out to General Clark that the position was a death trap and there would be no survivors. Agreeing, General Clark cancelled the operation, but Prime Minister Churchill revived it. Apparently the two allies had different concepts: the Americans viewed such a landing as another distraction from Cassino, but if they could not break through at Cassino, the men at Anzio would be trapped. Churchill and the British high command envisioned an outflanking movement ending with the capture of Rome. General Eisenhower, leaving to take command of Operation Overlord, left the decision up to Churchill with a warning about German unpredictability. Both sides finally agreed that the troops could not remain at Anzio, but Major General John P. Lucas received somewhat equivocal orders. He was to lead the Fifth Army's U.S. VI Corps in a surprise landing in the Anzio/Nettuno area, and make a rapid advance into the Alban Hills to cut German communications and "threaten the rear of the German XIV Panzer Corps" under General Fridolin von Senger und Etterlin. This threat would draw Germany's forces away from the Cassino area and make possible an advance there by Lieutenant-General Mark W. Clark. No one saw the point of taking the Alban Hills, nor was Churchill's idea of a flanking movement expressed.
General Clark did not feel he had the numbers on the southern front to exploit any breakthrough. His plan therefore was relying on the southern offensive drawing Kesselring's reserves in and providing the Anzio force the opportunity to break inland quickly. This would also reflect the orders he had received from Alexander to "...carry out an assault landing on the beaches in the vicinity of Rome with the object of cutting the enemy lines of communication and threatening the rear of the German XIV Corps [on the Gustav Line]." However, his written orders to Lucas did not really reflect this. Initially Lucas had received orders to "1. Seize and secure a beachhead in the vicinity of Anzio 2. Advance and secure Colli Laziali [the Alban Hills] 3. Be prepared to advance on Rome". and Lucas' natural caution stemming from his lack of experience in battle.
Neither Clark nor Lucas had full confidence in either their superiors or the operational plan. Along with most of the Fifth Army staff they felt that Shingle was properly a two corps or even a full army task. A few days prior to the attack, Lucas wrote in his diary, "They will end up putting me ashore with inadequate forces and get me in a serious jam... Then, who will get the blame?" and "
In the first days of operations, the command of the Italian resistance movement had a meeting with the Allied General Headquarters: it offered to guide the Allied Force in the Alban Hills territory, but the Allied Command refused the proposal.
Winston Churchill was clearly displeased with this action. "I had hoped we were hurling a wildcat into the shore, but all we got was a stranded whale," he said.
Lucas's decision remains a controversial one. Noted military historian John Keegan wrote, "Had Lucas risked rushing at Rome the first day, his spearheads would probably have arrived, though they would have soon been crushed. Nevertheless he might have 'staked out claims well inland.'" However, Lucas did not have confidence in the strategic planning of the operation. Also, he could certainly argue that his interpretation of his orders from Gen. Clark was not an unreasonable one. With two divisions landed, and facing two or three times that many Germans, it would not have been unreasonable for Lucas to consider the beachhead insecure. But according to Keegan, Lucas's actions "achieved the worst of both worlds, exposing his forces to risk without imposing any on the enemy."
The German units in the immediate vicinity had in fact been dispatched to reinforce the Gustav Line only a few days earlier. All available reserves from the southern front or on their way to it were rushed toward Anzio; these included the 3rd Panzer Grenadier and 71st Infantry Divisions, and the bulk of the Luftwaffe's Hermann Göring Panzer Division. Kesselring initially considered that a successful defence could not be made if the Allies launched a major attack on January 23 or January 24. However, by the end of January 22, the lack of aggressive action convinced him that a defence could be made. Nevertheless, few additional defenders arrived on January 23 although the arrival on the evening of January 22 of General Alfred Schlemm and his 1st Parachute Corps headquarters brought greater organisation and purpose to the German defensive preparations. By January 24, however, the Germans had over 40,000 troops in prepared defensive positions.
Three days after the landings, the beachhead was surrounded by a defence line consisting of three divisions: The 4th Parachute Division to the west, the 3rd Panzer Grenadier Division to the center in front of Alban Hills, the Hermann Göring Panzer Division to the east.
The Wehrmacht's 14th Army, commanded by Gen. von Mackensen, assumed control of the defence on January 25. Elements of eight German divisions were employed in the defence line around the beachhead, and five more divisions were on their way to the Anzio area. Kesselring ordered an attack on the beachhead for January 28, though it was postponed to February 1.
On February 16 the Germans launched a new offensive (Operation Fischfang) down the line of the Via Anziate. By February 18, after desperate fighting, the Allies' Final Beachhead Line (prepared defenses more or less on the line of the original beachhead) was under attack. However, a counterattack using VI Corps' reserves halted the German advance, and Fischfang petered out with both sides exhausted. During Fischfang the Germans had sustained 5,400 casualties, the Allies 3,500. Both had suffered 20,000 casualties each since the first landings. Also on February 18 while returning to Anzio the HMS Penelope light cruiser was struck by two torpedoes and sunk with a loss of 417 men. Despite the exhausted state of the troops, Hitler insisted that 14th Army should continue to attack. Consequently a further assault was mounted on February 29, this time on LXXVI Panzer Corps' front around Cisterna. This push achieved little except to generate a further 2,500 casualties for the 14th Army.
In March, the 2nd Italian SS "Vendetta" Battalion and 29th Italian SS Rifle Battalion were sent to fight against the Anglo-American forces at the Anzio/Nettuno beachhead. Dispersed among German battalions, the German commanding officers later gave the Italians companies favourable reports. Because of the demonstration of courage and sense of duty displayed by the volunteers of the Italian SS, they are designated as units of the Waffen-SS, with all the duties and rights that that entailed.
In March, U.S. 34th Infantry Division and in early May, U.S. 36th Infantry Division had arrived at Anzio whilst the British 56th Infantry Division had been relieved by British 5th Infantry Division. By late May, there were some 150,000 Allied troops in the bridgehead including five U.S. and two British divisions, facing five German divisions. The Germans were well dug into prepared defenses, but were weak in numbers of officers and NCOs and, by the time of the late May offensive, lacked any reserves (which had all been sent south to the Gustav fighting). Despite Alexander's overall plan for Diadem requiring VI Corps to strike inland and cut Route 6, Clark asked Truscott to prepare alternatives and to be ready to switch from one to another at 48 hours' notice. Of the four scenarios prepared by Truscott, Operation Buffalo called for an attack through Cisterna, into the gap in the hills and to cut Route 6 at Valmontone. Operation Turtle on the other hand foresaw a main thrust to the left of the Alban Hills taking Campoleone, Albano and on to Rome. On May 5, Alexander selected Buffalo and issued Clark with orders to this effect.
However, Clark was determined that VI Corps should strike directly for Rome as evidenced in his later writing: "We not only wanted the honour of capturing Rome, but felt that we deserved it... Not only did we intend to become the first army to seize Rome from the south, but we intended to see that people at home knew that it was the Fifth Army that did the job, and knew the price that had been paid for it.". He argued to Alexander that VI Corps did not have the strength to trap the German 10th Army and Alexander, instead of making his requirements clear, was conciliatory and gave the impression that a push on Rome was still a possibility if Buffalo ran into difficulties. On May 6 Clark informed Truscott that "..the capture of Rome is the only important objective and to be ready to execute Turtle as well as Buffalo".
Mackensen had been convinced that the Allies' main thrust would be up the Via Anziate, and the ferocity of the British feint on May 23 and May 24 did nothing to persuade him otherwise. Kesselring, however, was convinced that the Allies' intentions were to gain Route 6 and ordered the Hermann Göring Panzer Division, resting 150 miles (240 km) away at Livorno, to Valmontone to hold open Route 6 for the Tenth Army, which was retreating up this road from Cassino.
In the afternoon of May 25 Cisterna finally fell to 3rd Division who had had to go house to house winkling out the German 362nd Infantry which had refused to withdraw and, as a consequence, had virtually ceased to exist by the end of the day. By the end of May 25, 3rd Infantry were heading into the Velletri gap near Cori, and elements of 1st Armored had reached within 3 miles (5 km) of Valmontone and were in contact with units of the Herman Göring Division which were just starting to arrive from Leghorn. On the evening of May 25 Truscott received new orders from Clark via his Operations Officer, Brigadier General Don Brand. These were, in effect, to implement Operation Turtle and turn the main line of attack ninety degrees to the left. Most importantly, although the attack towards Valmontone and Route 6 would continue, 1st Armored were to withdraw to prepare to exploit the planned breakthrough along the new line of attack leaving 3rd Division to continue towards Valmontone with 1st Special Service Force in support. Clark informed Alexander of these developments late in the morning of May 26 by which time the change of orders was a fait accompli.
At the time, Truscott was shocked, writing later "...I was dumbfounded. This was no time to drive to the north-west where the enemy was still strong; we should pour our maximum power into the Valmontone Gap to insure the destruction of the retreating German Army. I would not comply with the order without first talking to General Clark in person. ...[However] he was not on the beachhead and could not be reached even by radio.... such was the order that turned the main effort of the beachhead forces from the Valmontone Gap and prevented destruction of the German Tenth Army. On the 26th the order was put into effect." He went on to write "There has never been any doubt in my mind that had General Clark held loyally to General Alexander's instructions, had he not changed the direction of my attack to the north-west on May 26, the strategic objectives of Anzio would have been accomplished in full. To be first in Rome was a poor compensation for this lost opportunity".
On May 26, whilst VI Corps was initiating its difficult maneuver, Kesselring threw elements of 4 divisions into the Velletri gap to stall the advance on Route 6. For four days they slugged it out against 3rd Division until finally withdrawing on May 30, having kept Route 6 open and allowed 7 divisions from 10th Army to withdraw and head north of Rome.
On the new axis of attack little progress was made until 1st Armored were in position on May 29, when the front advanced to the main Caesar C Line defences. Nevertheless, an early breakthrough seemed unlikely until on May 30 Major-General Fred Walker's 36th Division found a gap in the Caesar Line at the join between 1st Parachute Corps and LXXVI Panzer Corps. Climbing the steep slopes of Monte Artemisio they threatened Velletri from the rear and obliged the defenders to withdraw. This was a key turning point, and von Mackensen offered his resignation which Kesselring accepted.
Raising the pressure further, Clark assigned U.S. II Corps which, fighting its way along the coast from the Gustav Line, had joined up with VI Corps on May 25 to attack around the right hand side of the Alban Hills and advance along the line of Route 6 to Rome.
On June 2 the Caesar Line collapsed under the mounting pressure, and 14th Army commenced a fighting withdrawal through Rome. On the same day Hitler, fearing another Battle of Stalingrad, had ordered Kesslering that there should be "no defence of Rome". Over the next day, the rearguards were gradually overwhelmed, and Rome was entered in the early hours of June 4 with Clark holding an impromptu press conference on the steps of the Town Hall on the Capitoline Hill that morning. He ensured the event was a strictly American affair by stationing military police at road junctions to refuse entry to the city by British military personnel.
Volume 5 of Churchill's The Second World War is riddled with implied criticism of Lucas, blaming the failure of Operation Shingle on his caution. However, Kesselring after the war was to opine Furthermore, Alexander in his Official Despatch was to say "the actual course of events was probably the most advantageous in the end." In his view, sufficient forces were available. He had clearly made great political efforts to procure certain resources, especially the extra LSTs needed to deliver a second division to shore, but also specific units useful to the attack such as U.S. 504th Parachute Regiment. He argued that even regardless of the tactical outcome of the operation, there was immediate strategic benefit with regard to the wider war. Following the landings, the German High Command dropped plans to transfer five of Kesselring's best divisions to North West Europe. This gave obvious benefit with regard to the upcoming Operation Overlord. Churchill also had to ensure the British dominated forces in Italy were contributing to the war at a time when the Russians were suffering tremendous losses on the Eastern Front.
What is clear is that because of Clark's change of plan, Operation Diadem (during which U.S. 5th and British 8th Armies sustained 44,000 casualties) failed in its objective of destroying the German 10th Army and condemned the Allies to a further year of brutal combat notably around the Gothic Line from August 1944 to May 1945. The greatest irony was that if the VI Corps main effort had continued on the Valmontone axis on May 26 and the days following, Clark could undoubtedly have reached Rome more quickly than he was able to do by the route northwest from Cisterna. The VI Corps also could have cut Highway 6 and put far greater pressure on the Tenth Army than it did.
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