 Complete the following phrase:  To annihilate the guerrillas in the Mantaro Valley, in January 1882, Lynch ordered an offensive with 5,000 men under the command of Gana and Del Canto, first towards Tarma and then southeast towards Huancayo, reaching Izcuchaca. Lynchs army suffered enormous hardships including cold temperatures, snow and mountain sickness. On July 9, 1882, they fought the emblematic 