Because you could just sit in your trench and wait for the opponent to attack, at which point you could shoot him, throw explosive devices, or even use chemical weapons that weren't banned then.
it is said the allies won WW1 by staying in a stalemate of trench warfare. and holding the axis powers at bay, till the u.s came with fresh soldiers and so it made an impact.
<span>In antebellum America, a religious revival called the Second Great Awakening resulted in thousands of conversions to evangelical religions. Itinerant preachers, such as Charles Granison Finney, traveled from town to town, lecturing to crowds about eradicating sin in the name of perfectionism. Camp meetings, or large religious gatherings, also gave the devout opportunities to practice their religion and for potential conversions of non-believers. In addition to a religious movement, other reform movements such as temperance, abolition, and women's rights also grew in antebellum America. The temperance movement encouraged people to abstain from consuming alcoholic drinks in order to preserve family order. The abolition movement fought to abolish slavery in the United States. The women's rights movement grew from female abolitionists who realized that they too could fight for their own political rights. In addition to these causes, reforms touched nearly every aspect of daily life, such as restricting the use of tobacco and dietary and dress reforms.</span>
The did the work without pay . They came and were still slaves , therefore they worked without getting payed and treated bad.
