Movement question in Simulatanous game (PBW)

[1FSTCAT]

If my fleet of ships attacks an enemy fleet, and my fleet moves at a rate of 7, and his at a rate of 6, assuming that we're adjacent, and the enemy tries to flee, will my ships move first, and immediately incite combat in the destination, or will I end up chasing his fleet down, for all 6 of his moves, before combat begins?

Assuming that combat would start immediately, I assume it would make no difference if I gave the fleet the "attack" command, and choose a ship, as opposed to just moving the fleet into the enemies' square?

Thanks!!

--Ed