On Dec. 7 1941 7:55 the Japanese launched an attack on pearl harbor there was no warning so, many service men weren't ready to fight. There were 2 different attacks. 2,335 service men were killed, 1143 were wounded and 68 civilians die 35 wounded. The japanese planed the attack on sunday cause they thought the americans would be relaxed and not be ready for the attack. The japanese fought for many reason, one was cause the US stoped exporting steal, scrap iron and fuel. Another reason was to scare the US so the if they go into war with the britain that the US would not get involed.