Right before the German invasion of Crete, there were still some 14,000 Italian prisoners on the island of Crete. The British wanted to transfer them off the island, but the Greeks had hesitated, because they were concerned that the transfer might violate international law. In any case, the prisoners were still there when the Germans invaded.
A small number of reinforcements and equipment had arrived on Crete prior to the German invasion. There were about 2,200 marines and their guns and searchlights. There were also two British infantry battalions, 16 light tanks, and 6 infantry tanks. There were also sent a troop of 3.7in mountain guns. All this was helpful but insufficient to meet the attack that would be launched. This is based on the account in Vol.II of the Australian Official History.