The Sandinistas opened fire from all along the mule train's right flank at 1:30 PM, while some other rebels managed to seal off "the trail to the front and rear of the convoy."[12] These Nicaraguan insurrectionists were estimated to be "at least" 600 rifles strong, armed with "a minimum" of four machine guns and "a large quantity" of dynamitebombs.[13] The Marines fell back to a ridge on the left of the trail, "leaving three of their dead behind."[14] The guerrillas advanced on the American position and hacked open the heads of the dead Marines with their machetes.[15] At 8:30, the firing from the Sandinistas decreased as the insurgents began to withdraw, although about 200 of them remained to continue harassing the Marines.[16] Some of the guerrillas spoke "irregular English" and taunted the Americans with "slurs and insults" during lulls in the fighting.[17]
At dawn of the following day, of the 28 February, a force of 88 Marines led by Captain William K. MacNulty arrived on the battlefield to relieve O'Day's men, and they helped drive off the remaining Sandinistas.[18] All in all, the Marines suffered three killed, two died from wounds, and eight non-fatally wounded (in addition, four of their "muleros" were wounded).[19] One-third of their mules were killed, wounded, or captured.[20] Sandinista losses for February 28 were about 10 killed and 30 wounded (this was MacNulty's "conservative estimate").[21]
A "large part" of the rebel force at El Bramadero was recruited from nearby towns and villages, with these part-time guerrillas returning to their homes and regular occupations when fighting ceased, owner of LA PRENSA said he received a number of empty gasoline cans with marines heads inside.[22]