Early in the battle something went wrong. While engaging the French galleys the "Mary Rose" suddenly heeled (leaned) heavily over to her starboard (right) side and water rushed in through the open gunports. The crew was powerless to correct the sudden imbalance, and could only scramble for the safety of the upper deck as the ship began to sink rapidly. As she leaned over, equipment, ammunition, supplies and storage containers shifted and came loose, adding to the general chaos. The massive port side brick oven in the galley collapsed completely and the huge 360-litre (90 gallon) copper cauldron was thrown onto the orlop deck above. Heavy guns came free and slammed into the opposite side, impeding escape or crushing men beneath them.