The trenches used by the Filipinos as defense during the Battle of Zapote River in 1899 in the Philippines.
Unknown US Army photographer
University of Michigan Library: <a rel="nofollow" class="external free" href="http://quod.lib.umich.edu/s/sclphilimg/x-287/PHLA327?g=southeastasia-icgr;lasttype=boolean;lastview=thumbnail;resnum=1;size=20;start=1;subview=detail;view=entry;rgn1=sclphilimg_all;select1=all;q1=zapote">http://quod.lib.umich.edu/s/sclphilimg/x-287/PHLA327?g=southeastasia-icgr;lasttype=boolean;lastview=thumbnail;resnum=1;size=20;start=1;subview=detail;view=entry;rgn1=sclphilimg_all;select1=all;q1=zapote</a>