I find it odd that Earth after being attacked more then a few months earlier had 0 ships in position to defend her if Enterprise failed in the mission. The only theory I can come up with is because time and space is so jacked up in shockwave that when they come out of here vortex it was already world war II time period.. but if this has been discussed earlier then never mind I just found it weird. but would explain when they go back to there own time the fleet is there wondering where the enemy is at.