scylla vs galleons.
Way I do it:
ambush and ram the galleon, then sine up behind hind or on his sniper side. front side of a galleon is hard to stay on, but most players cant react to behind or sides. if you go on the sniper side too, chances are the only thred there will be the mercury, but if he wants to use his hull engie on the merc, then he will die faster anyway.
if he tries to turn, just follow him around, the scylla has a large clip so your gunner can basicly just keep pressing the trigger.
now when the hull of the galleon is down, we all know its hell for the hull engineer when he gets hit by 5 mortars in a row, often if charged is used, results in instant death without the need for reload.