Editing Exercise Tiger (section)

===Friendly fire incident===
The first practice assault took place on the morning of 27 April{{sfn|Dear|Foot|2001|p=787}}{{sfn|Herman|1997|p=191}} and was marked by an incident involving [[friendly fire]]. [[H-hour]] was set for 07:30, and was to include live ammunition to acclimatise the troops to the sights, sounds and even smells of a naval bombardment. During the landing itself, live rounds were to be fired over the heads of the incoming troops by forces on land, for the same reason. This followed an order made by General [[Dwight D. Eisenhower]], the Supreme Allied Commander, who felt that the men must be hardened by exposure to real battle conditions.{{sfn|Small|Rogerson|1988}} The exercise was to include naval bombardment by ships of [[List of ships of Force U Bombardment Group|Force U Bombardment Group]] fifty minutes prior to the landing.{{sfn|Lewis|1990|p=252}}

Several of the landing ships for that morning were delayed, and the officer in charge, American Admiral [[Don P. Moon]], decided to delay H-hour for 60 minutes, until 08:30.{{sfn|Small|Rogerson|1988}} Some of the landing craft did not receive word of the change. Landing on the beach at their originally scheduled time, the second wave came under fire, suffering an unknown number of casualties. Rumours circulated among the fleet that as many as 450 men were killed.{{sfn|Lewis|1990|p=254}}