How Britain lost Fortress Singapore

On the 15th of February 1942, Lt General Arthur Percival signed the largest surrender in British history at Singapore. The city was supposed to be a fortress, but his force of 85, 000 men had been defeated by just 35, 000 Japanese troops. Little over 2 months earlier Japanese forces had invaded northern Malaya. Thanks to their advanced tactics and training, the Japanese advanced with incredible speed pushing the unprepared British back to Singapore in a socalled bicycle blitzkrieg. When they crossed the Johore straights and captured the Bukit Timah heights above Singapore itself, Percival was forced to surrender. So how did the Japanese defeat a numerically superior force Why wasnt Singapore an impregnable fortress And could the British have held out