Why did armies fight in long lines

The line was considered as the fundamental battle formation as it allowed for the largest deployment of firepower. Troops in skirmish formation, though able to take cover and use initiative, were highly vulnerable to cavalry and could not hold ground against advancing infantry columns.

ask google there you might be able to find an answer for the question you're trying to ask

hey there! these are the answers.

to generate donations

to organize supporters

to solicit support