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How did high-explosive shells and gas create opposing dangers for soldiers in World War I?

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tactics Sumerian phalanx, a block of foot soldiers depicted standing shield-to-shield, presenting spears, and advancing in a dense mass, detail from the Stele of the Vultures, limestone bas-relief, c. 2450 bce; in the Louvre Museum, Paris.

In World War I, the combined use of high-explosive shells and chemical weapons created a tactical dilemma for soldiers because these threats demanded contradictory defensive responses.1

High-explosive artillery forced troops to seek shelter in deep dugouts or trenches to survive the bombardment. Conversely, chemical weapons—such as choking agents and blister agents—often settled in low-lying areas, including those same trenches and dugouts, where the gas could linger and reach high concentrations.213

This forced soldiers into a dangerous trade-off:
* Seeking Cover: Staying in deep shelters provided protection from high-explosive fire but increased the risk of exposure to trapped gas clouds.1
* Protective Gear: Donning gas masks and protective suits was essential for survival against chemical agents, but these items significantly reduced combat effectiveness, caused fatigue, and limited mobility, making soldiers more vulnerable to conventional infantry assaults.43

Commanders often coordinated these weapons to maximize this confusion, as the need to manage both physical destruction and toxic contamination severely strained the defensive capabilities of troops on the Western Front.1