With all respect, but a PVE event would consists of players vs npcs. It was PVP event, in which one side was to defend the NPC ships and the other had to destroy them. Been there. Saw that. GRN-side tried really hard to down these fat cows and the fact someone decided to add fourth siege cruiser is far from balance, if Gauls had serious issues to down even two of three them.
But that's my impression from what I have seen in-game and read on the forums.