Final answer:
The question of how many troops were injured across the depicted historical events does not have a specific answer in the provided excerpts. Multiple incidents are referenced, each with different outcomes in terms of casualties, and while some numbers of fatalities are given, detailed injury counts for troops are not explicitly stated.
Step-by-step explanation:
Based on historical events presented in the provided excerpts, there is no singular answer to the question of how many troops were injured as the instances of conflict mentioned do not refer to a unified event. Tensions and conflicts have resulted in various casualties across different times and locations. The provided information points to multiple separate incidents wherein troops faced resistance and violent action.
One excerpt refers to the May 4th incident where the National Guard faced off against student protesters, resulting in four students killed and nine wounded, but not specifying troop injuries. Another case of conflict mentioned is the Battle of Mogadishu, which led to eighteen US soldiers killed, though again detailed figures on troop injuries are not provided. The provided references mention casualties involving US troops, soldiers, and the police, but do not give specific numbers for injuries outside of deaths.
In the context of history, understanding these events requires a comprehensive approach that includes the evaluation of primary sources, news accounts, and retrospective analyses to determine the full extent of injuries and fatalities. Each event, whether it be an attack by insurgents, a student protest, or an international conflict, requires separate examination and evaluation to ascertain the number of troops injured.