The Krellus Envelopment was a Romulan starship tactic. A wing targets a large target flying straight towards it before breaking into two or more sections to surround the enemy vessel. Once they have surrounded the target all the ship fire at the vessel until it is destroyed, taking care to select angles that if they miss their target won't hit a friendly vessel. (The Dominion War Sourcebook: The Fires of Armageddon)