Oh. On another note.
Note that Valrack mentions in the battle they saw, the Tombship ARRIVED followed by the Ark Mechanicus ARRIVING later.
Confirmed Escalation mission type?
(For those that are unfamiliar with the tabletop. In escalation, both players started with a single squadron of ships, usually a cruiser and maybe escorts if you had them each turn there was a chance that new ships from the players fleets would arrive on the tabletop.
A lucky player could get multiple ships on the board early and begin strategising while the enemy, unfortunate as he or she was, has their ships coming in piecemeal allowing the enemy to chew your forces apart.
But mismanage that step and the enemy, with relatively fresh ships compared to yours which have sustained damage (maybe criticals or even full on crippled) and the balance of power can flip the other way HARD. In my experience, almost everyone preferred their Battleships to be the last to arrive on the field. Whole, intact, and ready to mop up with high explosive.)