Capture of Mazatlán The Capture of Mazatlán was a Mexican victory during the Maximilian Affair . Mazatlán was a key port of the Pacific trade routes yielding between $ 4 million - $ 5 million a year . First battle . After his arrival in the city , Colonel Gaspar Sanchez Ochoa rapidly fortified the north land entrance of the city at the foot of the Nevería hill of on the north side , extending to the old harbor . On the opposite side , towards the town , he set up his headquarters , to the beach , he installed some small pieces of artillery and groups of soldiers were placed in reserve in a well situated position to the west , where there are three islands close to the side the old port . On 28 March 1864 the French flagship " La Cordelière " appeared near the center island , signaling between the French war vessels and boats which were about to land artillery and troops . French ships were being spread to a half circle around the shooting range of the port . At first all the boats advanced a league forward and unleashed their fires while approaching the Mexican positions , which was answered by six batteries commanded by the Captain Benitez Martial . Then a group of boats evaded to the left and only three boats remained in front of the total fourteen and landed the troops . Captain Marcial Benitez stayed on the beach , with two batteries to face the ships , while Colonel Gaspar Sanchez Ochoa with four pieces , commanded by Artillery Captain Jose Gamboa , and two battalions , advanced to confront those who had just landed and went by land . He proceeded quickly by ordering his troops to march at double time and to open fire , then switched into " battle formation " and following an artillery strike , and a series of gunshots ; the French soldiers fled toward the boats . The victory by land had been of greater importance , though an unfortunate accident halted the enthusiasms of the Mexicans for a few minutes . The first captain of Engineers Miguel Quintana , responsible for putting the pieces of battery to shell upon the invaders who came by land , along with Lieutenant Cleopas Tagle , also of Engineers , wanted to personally roll some cartridges to position , when those exploded under unclear circumstances , and a grenade left Quintana seriously injured , three other gunners and a sergeant wounded and one soldier dead . Meanwhile the French boats rowed back to the ships with the surviving landing forces carrying their dead and wounded . The battle continued on the 31st when " La Cordelière " positioned itself to half firing range to face the fortifications , picked up her sails , triced up her war flag and hoisted her signal fire , and proceeded to launch 120 pounds bomb into the city , injuring some workers and regulars . Colonel Ochoa rode to the shore with the only piece that had a wider range , commanded by Captain Benitez Martial . He exchanged shots with " La Cordelière " for six hours with its 80 - caliber cannon , until the French ship was covered in smoke and fire . The French flagship ' s inaccurate shots failed to do much damage in the forts or crew . Late that night , governor Jesus García Morales arrived on the scene and observed the combat as well as the British war sloop - of - war " Charybdis " and " Lancaster " of the American Navy . " La Cordelière " had to obey to the damages done to its deck , doused the war flag , and withdrew to the nearby island of Islas del Venado . Surrender . The takeover of the city was preceded by a naval blockade dating from mid - April 1864 and a four - way oligarchy regarding the control of the city within the juarista party . In May Plácido Vega , 3rd division central army General and his volunteer garrison guarded Mazatlán . In October 1864 Jesus García Morales the liberal governor of Nuevo León and one of his officers Ramón Corona both dedicated to take supreme control of Mazatlán and had internal disputes that resulted in Morales putting an arrest warrant on his officer for misappropriation . On 10 October Ramón Corona was residing in the Presidio some miles away south - east of the city . He emptied the fort the next day and moved to the direction of Los Urias halway to Mazatlán and asked Morales to officially surrender to him on 15th . Morales declined it and issued immediate war preparations against his fellow rebel officer . He mounted all the guns of the port ( 48 pieces ) to the land passage into the city . His 500 - strong garrison faced 600 infantry and 200 cavalry . Corona also had 1000 reinforcements put on reserve . At 2 a . m . Corona launched an assault from the south 1 . 5 miles far from the city center . His army easily broke through the first line of defense of the artillery . After a very short close combat Morales ' soldiers retreated in disorder . Corona claimed the city for himself and arrested Morales personally . Altogether 18 Republicans were killed and 15 more wounded just before the arrival of the French forces . Antonio Rosales governor of Sinaloa arrived to the scene in late October and subdued the city for himself overthrowing the sovereignty of the previous pretenders . Seeing this situation the inhabitants were favoring a French occupation therefore . On the 24 October three French warships , the " Victoire " , " D ' Assas " and the " Diamant " departed from Acapulco with two Zouve companies ( 250 riflemen ) led by Gustave - Joseph Munier , 150 marins , and 70 Egyptians on board . under the command of Captain Thomas Louis Le Normant de Kergrist . Manuel Lozada , an Imperialist officer approached the vicinity of the town from the inland and waited for the enclosure by the French navy . The city began its evacuation and the population flee away from the coastline . On 12 November the Pacific Naval Division reached the port and was greeted by Commander Rosales under the flag of truce . Negotiations started on the very day and ultimatum was handed over by the French with a deadline of 13 November . A second written notice was then sent further threatening the Mexican command that any resistance would have resulted in immediate hostilities that ' d have also affected the neutral ( mostly American ) ships in the harbour . Rosales replied with putting the coastal batteries on alert whereas they could have fired on any ship coming within their range . Next day at six o ' clock the frigates started the shelling of the houses damaging several of them . The Republican commander escorted by the local consuls sailed to the flagship on a boat to inform the French high command that they had fulfilled the criteria for surrender the previous night and thus evacuated Corona ' s garrison as requested . French troops landed and Lozada ' s men ( a force of 5000 soldiers ) seized the city . One American citizen was shot on sight . Connection with San Blas and Zacatecas was established and weapons trade and carrying of any arms were prohibited . Advocate for surrender General Corona tried to retake the city three times unsuccessfully in 1866 . Only after Lozada ' s defection and disbandment due to unpayment could the liberal forces regain possession of the city on 13 November 1866 .