In the centre of the 4th Marine Platoon position were the remnants of Second Lieutenants Óscar Silva's and Marcelo Llambías-Pravaz's RI 4 platoons as well as the remnants of Second Lieutenants Celestino Mosteirín's and Marcelo Dorigón's RI 12 platoons, which had recently fought on Two Sisters, Goat Ridge and Mount Harriet.