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I have seen it brought up a few times around this site. For those that don't know the US Army was organized briefly in 1790s under Anthony Wayne as a Legion broken down into smaller units and organized in a combined arms fashion (Infantry and Calvary working together).
Why was it dropped in the first place?
How does this affect military tactics?
How would this affect US-Indian confrontations during the 19th century if this were to stay in affect?
Lastly, What are the benefits and drawbacks to this organization?