The Other Amphibious Sherman Tank
Posted: 08 Jan 2010, 21:59
This is the story of the T6 flotation device for the M-4 Sherman -- the rival for the DD drive system used so disasterously on D-Day in Normandy -- as told by Floyd Coleman, and ordnance enlisted man assigned to the project.
The T6 is also called the M19 device in "British and American Tanks of World War II" by Chamberlain and Ellis
There was a T7 floatation device for the M18 Hellcat and a M20 device for the m24 chaffee.
Some 250 were built for each vehicle type. Only the T6 was used in combat when 45 were launched on Marine tanks at Okinawa. Some were put in the water 10 miles (!) off the coast and still managed to get to shore.
See:
http://www.warriorsaga.com/
The Blankenship team assembled T-6 units and demonstrated them to various commanders. It fell to Lieutenant Coleman to give a presentation to General George Patton. He met with Patton and gave an oral explanation of the T-6 unit and how it worked. Patton was impressed with the concept and particularly with the idea of the infrantry being able to use the discarded flotation tanks as cover on the beach. He thanked Coleman and told him that he would be in touch as matters progressed with the invasion plans. Unbeknownst to the general public, Patton was only in command of a phantom army at this time. It was an elaborate deception against the Germans. It worked well, but Patton did not arrive in France until after the Normandy invasion, so he was not heard from again concerning the T-6 project.
By May 1944, the Supreme Allied Command authority decided against using the Blankenship T-6 system in favor of the Gruver system with the flotation skirt. Reason being that the Blankenship was 45 feet in length and reduced the number of M-4 tanks that could be transported by half. Coleman and his team were detailed to accompany the Gruver units as they made their landings on the Normandy beaches and report on their performance. Everyone drew their combat equipment and loaded on the LSTs along with the Gruver equipped M-4 Medium tanks. As the LSTs approached Normandy on June 6, 1944 (D-Day), the tanks were made ready for launching. A tragic oversight had been made with the Gruver systems. When they had been tested at various times, it was never with a fully loaded tank! The initial tests in the Chesapeake Bay had been with no ammunition on board, nor full fuel load, or full crew or crew equipment. The Chesapeake was smooth compared to the sea around Normandy. Now they were being launched with full ammo load, full fuel, full crew and crew equipment as well as additional essential spare parts on board. The first four tanks that were launched immediately foundered and sank taking most of their crews to the bottom with them!
Coleman realized what was happening and sought out the officer in charge of launching the tanks. He was a captain and Coleman told him he needed to stop launching the Gruver equipped tanks, he was just killing the men in them. He replied that his orders were to launch them and he would do so. Coleman went to find higher authority when he met a colonel coming his way who had realized the disaster in the making. He ordered the captain to cease launching the tanks. Other LSTs had similar experiences. Some tanks did make it to shore but the losses were very high. The remainder of the armor wasn’t unloaded until the LSTs could come close to the shore later in the landings. After the armor was ashore Coleman and his crew returned to England.
Back in England, Coleman’s crew continued to train the British on the use of the Blankenship T-6 systems, which were back in favor after the disaster with the Gruver system. There was some slack time during this period and Coleman and his crew spent several days in London. While there the British provided him with a chauffeur and a car. The chauffeur was a female British sergeant who had previously been Bob Hope’s chauffeur while he was on his USO Tours in England. She knew all the right places to go!
The T6 is also called the M19 device in "British and American Tanks of World War II" by Chamberlain and Ellis
There was a T7 floatation device for the M18 Hellcat and a M20 device for the m24 chaffee.
Some 250 were built for each vehicle type. Only the T6 was used in combat when 45 were launched on Marine tanks at Okinawa. Some were put in the water 10 miles (!) off the coast and still managed to get to shore.
See:
http://www.warriorsaga.com/
The Blankenship team assembled T-6 units and demonstrated them to various commanders. It fell to Lieutenant Coleman to give a presentation to General George Patton. He met with Patton and gave an oral explanation of the T-6 unit and how it worked. Patton was impressed with the concept and particularly with the idea of the infrantry being able to use the discarded flotation tanks as cover on the beach. He thanked Coleman and told him that he would be in touch as matters progressed with the invasion plans. Unbeknownst to the general public, Patton was only in command of a phantom army at this time. It was an elaborate deception against the Germans. It worked well, but Patton did not arrive in France until after the Normandy invasion, so he was not heard from again concerning the T-6 project.
By May 1944, the Supreme Allied Command authority decided against using the Blankenship T-6 system in favor of the Gruver system with the flotation skirt. Reason being that the Blankenship was 45 feet in length and reduced the number of M-4 tanks that could be transported by half. Coleman and his team were detailed to accompany the Gruver units as they made their landings on the Normandy beaches and report on their performance. Everyone drew their combat equipment and loaded on the LSTs along with the Gruver equipped M-4 Medium tanks. As the LSTs approached Normandy on June 6, 1944 (D-Day), the tanks were made ready for launching. A tragic oversight had been made with the Gruver systems. When they had been tested at various times, it was never with a fully loaded tank! The initial tests in the Chesapeake Bay had been with no ammunition on board, nor full fuel load, or full crew or crew equipment. The Chesapeake was smooth compared to the sea around Normandy. Now they were being launched with full ammo load, full fuel, full crew and crew equipment as well as additional essential spare parts on board. The first four tanks that were launched immediately foundered and sank taking most of their crews to the bottom with them!
Coleman realized what was happening and sought out the officer in charge of launching the tanks. He was a captain and Coleman told him he needed to stop launching the Gruver equipped tanks, he was just killing the men in them. He replied that his orders were to launch them and he would do so. Coleman went to find higher authority when he met a colonel coming his way who had realized the disaster in the making. He ordered the captain to cease launching the tanks. Other LSTs had similar experiences. Some tanks did make it to shore but the losses were very high. The remainder of the armor wasn’t unloaded until the LSTs could come close to the shore later in the landings. After the armor was ashore Coleman and his crew returned to England.
Back in England, Coleman’s crew continued to train the British on the use of the Blankenship T-6 systems, which were back in favor after the disaster with the Gruver system. There was some slack time during this period and Coleman and his crew spent several days in London. While there the British provided him with a chauffeur and a car. The chauffeur was a female British sergeant who had previously been Bob Hope’s chauffeur while he was on his USO Tours in England. She knew all the right places to go!