The Japanese were initially resisted by III Corps of the Indian Army and several British Army battalions. The Japanese quickly isolated individual Indian units defending the coastline, before concentrating their forces to surround the defenders and force their surrender. The Japanese forces held a slight advantage in numbers in northern Malaya and were significantly superior in close air support, armour, co-ordination, tactics and experience, Japanese units having fought in the Second Sino-Japanese War. The Allies had no tanks, which had put them at a severe disadvantage. The Japanese also used bicycle infantry and light tanks, which allowed swift movement of their forces overland through terrain covered with thick tropical rainforest, albeit criss-crossed by native paths. Although the Japanese had not brought bicycles with them (to speed the disembarkation process), they knew from their intelligence that suitable machines were plentiful in Malaya and quickly confiscated what they needed from civilians and retailers.