Getting the oarsmen to row as a unit, let alone to execute more complex battle manoeuvres, required long and arduous training. At least half of the oarsmen would need to have had some experience if the ship was to be handled effectively. As a result, the Romans were initially at a disadvantage against the more experienced Carthaginians. All warships were equipped with a ram, a triple set of bronze blades weighing up to positioned at the waterline. Rams were made individually by the lost-wax method to fit immovably to a galley's prow, and secured with bronze spikes. Ideally one would attack an enemy ship from its side or rear, thus avoiding the possibility of being rammed oneself. Skill was required to collide with an opposing galley forcefully enough to break loose its timbers and cause it to founder, but not so forcefully as to embed one's own ram inextricably in the sinking enemy. Each vessel relied to a large extent on the other vessels in its squadron for protection, and tactics involved the manoeuvring of whole squadrons rather than individual ships; although battles sometimes broke down into a series of ship on ship combats which have been likened to aerial dogfights.