This is a series of maps used by the Malaya Command during the Malayan Campaign. One needs to know how big (small) Singapore is in order to appreciate how desperate the last days were.
9 December 1941
15 December 1941
22 December 1941
28 December 1941
20 January 1942
4 February 1942
5 February 1942
8 February 1942
9 February 1942
10 February 1942
12 February 1942
13 February 1942
15 February 1942
Those red question marks.