| Conflict: | Action of 28–29 December 1669 |
| Date: | 28–29 December 1669 |
| Place: | Straits of Gibraltar |
| Result: | English victory |
| Combatant2: | Corsairs of Algiers |
| Commander1: | Capt. John Kempthorn |
| Strength1: | 1 frigate, escorting a convoy of armed merchantman |
| Strength2: | 7 large ships |
| Casualties2: | Heavy |
On 28 December 1669,[1] as the Mary Rose, a third-rate, carrying forty-eight guns, with a crew of 230 men, commanded by Captain John Kempthorn, was convoying a fleet of merchant ships through the Straits of Gibraltar, seven large Algerine corsairs, full of men, stood towards her.[2] Captain Kempthorn ordered the convoy to make sail, while he, single-handed, advanced to engage the foe. The fighting continued into the following day, as the Algerines attacked the Mary Rose with much fury, and boarded her; but were beaten off with considerable loss. The convoy reached Cádiz in safety.