Novastrike

One of the objectives in the very first mission is to destroy a Heralder. The difficulty here comes from the limited time you have to destroy it when it's moving from island to island. A common strategy is to go ahead to the next docking point when the ship stops and destroy the ships and ground structures first, then come back and get the ship on the move again and just lay into it. After it leaves the third base you only have a short amount of time to destroy it but if you fail, just pause and restart.