The night conditions of May 14-15, 1918, were the specific conditions of forest warfare: limited visibility, sounds amplified by the quiet, the possibility of contact coming from any direction. Johnson heard the wire cutters before he saw anything. The hearing was the warning.
## The Bolo Knife: Weapon and Tool
The bolo knife that Johnson used in the hand-to-hand fighting at Outpost 20 was a standard piece of infantry equipment in the American Army of the period, and it appears in the accounts of the action as the weapon that defined the most extreme phase of the fight.
The bolo was a heavy, single-edged knife with a curved blade, originally designed for agricultural use in the Philippines and adopted by the American military after the Philippine-American War. The Army had been using it as a standard issue sidearm since the early 1900s. Its primary utility was as a tool: cutting wire, clearing brush, digging in hard soil. As a weapon, it was formidable at close range — heavy enough to deliver significant force, durable enough to withstand the kind of use that a metal-on-metal confrontation might require.
That Johnson used it in the specific circumstances of May 15, 1918 — after his rifle jammed, after he used the rifle as a club until it broke, with German soldiers at hand-to-hand distance in a forest at night — reflects the specific nature of the action. This was not a firefight conducted at a distance with firearms. It was close-range combat in conditions where the weapons of distance had either run out or failed.