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Beginning at 1800, 3 September, one group of engineers fanned out to the front and right flank of Company Bís lines. Despite fire from Hill 117 and enemy positions to the west, the demolitions men strung out dozens of antipersonnel mines, hand grenades, and blocks of TNT wrapped with 60-penny spikes. Before darkness set in, Baker Companyís forward slopes had the potential of an active volcano.

In Company Aís zone, Technical Sergeant David N. Duncan and Sergeant Bryan K. White led the other half of the engineer platoon in laying a similar field of obstacles. Duncan crowned his handiwork with a 40-pound shaped charge hooked up in a gully with a trip wire.