6th December. The attack on the Morro was led by Major Beauchef and Captain Videla, with a mixed force of Chilians and Argentines. Mounting on the shoulders of their men they scaled the outer wall, and tore down a portion of the stockade behind, when such a heavy fire was poured upon them that Videla being killed and Beauchef severely wounded, the column could advance no farther, till Las Heras brought up the supports, when the position was carried by the bayonet. At the same time a Spanish gunboat on the Bio-Bio was captured by some boats led by an Englishman named Manning, and an unauthorised attack by Conde on the centre was repulsed.
At daybreak Las Heras found to his dismay that the Morro was merely an advanced work, and that he was still outside of the line of entrenchments. Colonel Boedo fell in attempting to force his way beyond; the guns of two forts on the heights, those of the frigate Venganza, and those of some gunboats converged their fire upon the conquered outwork, causing heavy losses; in spite of which Las Heras maintained his position till O'Higgins sent him orders to retire, which he did in good order, after spiking the guns he had captured, and carrying with him his wounded and prisoners. The loss of the Patriots was 150 killed and 280 wounded.
This disaster put an end for the time to all offensive operations, and on the day of the assault another strong reinforcement of Royalist troops embarked at Callao for Talcahuano.
