Bands of guerrillas burned and plundered in some sections, and were not entirely suppressed until after the war was ended.
But Zumalacarregui, who was noted for his grave and silent disposition and his strong religious principles, disliked the disorderly life of the guerrillas, and when regular forces were organized in the north he entered the 1st battalion of Guipuzcoa as an officer.
This was done by the guerrillas in Spain, by the mountain tribes in the Caucasus, and by the Russians in 1812.
With the capture of Aguinaldo on the 23rd of March 1901, the resistance became little more than that of guerrillas.
The principle therein involved applies to guerrillas who are not lawful belligerents.