The Burma portion of the C-B-I operations was of most importance to the invading Japanese for these reasons:
1. Burma featured a very important overland route by which the Chinese forces of Generalissimo Chiang Kai-sheks were being supplied, by way of India. Japan planned to cut off that route, hence, greatly impairing the Chinese war effort in that area..
2. The Japanese planned to use the air fields in the extreme south of Burma to cover the main advance of its troops from Raheng along jungle track via Moulmein to Rangoon, in an effort to drive the British out of Burma.
The Japanese operation was under the command of General Iida and the Japanese Fifteenth Army.
The 15th was opposed by Britain and its allies at that stage of the war, the 1st Burma Division and the recently arrived 17th Indian Regiment.
America was not yet committed to C-B-I other than through air support provided by about 30 planes flown by members of the American Volunteer Group, the Flying Tigers.
The British contigent was under the command of General Hutton, and later by Alexander. Their line of defence extended from Rangoon in the south, to Kalewa, below Imphan,in the north. They were forced to withdraw from Burma to India, with an estimated 13,500 casualties to an estimated 4,500 for the Japanese.
The Japanese took all of Burma, and in 1942, cut the Burma Road, the only overland supply route for the Chinese. Subsequently, all supplies for China had to be flown over the HUMP.
Long recognizing the importance and need for the re-establishmnet of the land route, in 1944, General Jos. Stilwell led an American force into Burma for the purpose of opening the road at Lido, Burma, and extending it to Assam, India.
U.S. Engineers finished that last leg of this by-pass, which opened up to traffic at Lashio, Feb-45. The entire road, Burma-China was cleared June-45.
My brother-in-law, S/Sgt Decker Wright,was a member of the 456th Engineer Depot Company, which was long employed in the construction of the Burma Road, actually starting at Lido.
I have a fairly complete duty roster of the 456th's personnel, for anyone interested. On May 24, 1944, the 456th was inactivated, with remaining personnel assigned to 2757th Engineer Depot Company.
Depending on your reply with additional nformation, I will try to dig out something more related to your G/F. OK ?