The losses in the assault were very heavy. Of the fifteen hundred English engaged, forty-three officers and over six hundred men were killed and wounded, and the Fifteenth and Twenty-fourth both lost over a fourth of their numbers. The treachery of the guides was answerable for much, but the mismanagement of the officers was responsible for more. Colonel Grant was picked up alive, indeed, but desperately wounded. "The General ought to hang the guides and the King ought to hang the General," he gasped out in his agony; and a few hours later he was dead. Wentworth, striving hard to put a good face on the disaster, ordered a battery to be erected against Fort St. Lazar on that same evening; but by this time yellow fever had seized hold of the army in good earnest, and it was a question not of building batteries but of digging graves. On the 21st the General called a council of war and announced to the Admiral its decision that the number of men was insufficient for the work, and that the enterprise must be abandoned. "Since the engineers or pretended engineers of the army declare that they do not know how to raise a battery, we agree," answered Vernon and Ogle, "though if our advice had been taken we believe that the town might have fallen." Then with studied insolence of tone they proceeded to offer a few obvious suggestions for the withdrawal of the troops. The military officers, not a little hurt, remonstrated in mild terms against the taunt, and after a short wrangle Wentworth requested a general council of war, by which it was finally determined that the attack on Carthagena must be given up as impracticable. [Sidenote: April 17/28.] It was indeed high time. Between the morning of Tuesday the 18th and the night of Friday the 21st of April the troops had dwindled from sixty-six hundred to thirty-two hundred effective men. The two old regiments had been much shattered in the attack of St. Lazar, and the residue of the British force consisted chiefly of young soldiers, while the twelve hundred Americans who still survived were distrusted by the whole army, and were in fact little better than an encumbrance. On the 28th the troops were re-embarked, poor Wentworth being careful to carry away every scrap of material lest the Spaniards should boast of trophies. The naval officers grudgingly consented to blow up the defences of Boca Chica, and then for ten terrible days the transports lay idle in the harbour of Carthagena. [Sidenote: April 24/May 5.]