An incoming tide lets Farragut lower boiler pressure

The attack began with the tide running into Mobile Bay on 5 August. Its assistance allowed Farragut to reduce boiler pressure while maintaining the ships' progress. Lower pressure reduced the danger of a violent boiler failure if enemy fire damaged the machinery. A southwest breeze was also expected to carry smoke toward Fort Morgan, although the volume of smoke still forced Farragut to climb for a clearer view. The approach combined environmental conditions with precautions against battle damage.