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Not all were chivalrous. They generally were the best warriors of Europe. They were sons of other knights/or any other kind of noble. Most were in search of wealth.
As a device intended to knock down a sealed door of some kind, a battering ram is indeed a simple machine; or, at least, it can be. For, while sophisticated battering rams have been created and utilized, the trunk of a tree can serve just as well, when and where the gate or gateway to be rammed open is appropriately sized.
What kind of war tactics did who use?
There were all kind of people in the war.
Strategically - it was for the North to do the invading. Manpower wise - some of the best officers of the US army had resigned to join them, and the Southern rank-and-file were the kind of men already experienced in the soldierly skills like riding and shooting.
commensalism
relationship
What kind of phrase is "If you save your money
adjective phrase
ducks
A line graph, probably.
Verb phrase
adverb phrase
prepositional phrase.
adjective phrase
computer is a electronic device
A storage device.