Edited sentence: Although the Royal Navy was used to its home built frigates defeating French or Spanish ships of greater strength, Guerriere was a French built frigate and therefore not built as well as Royal Navy frigates, Constitutions victory was not surprising.There was a large disparity in strength between the two frigates; Constitution was almost half as large again than Guerriere, had a far larger crew, a main deck battery of 24-pounder guns to Guerrieres 18 pounders, and was more strongly constructed than the French-built Guerriere, which was also in need of a refit