Was the congressional junta a military junta?

Was the congressional junta in the Chilean Civil War a military junta?

No. It was a political council appointed by Congress to direct the war effort, not a military regime.

Junta can simply mean a council or organized group. Congress delegated wartime direction to a smaller political cabinet because voting in the full legislature on every military decision would have been unworkable. The council therefore ran the congressional war effort even though the navy was its critical military asset. A later return to the question explicitly distinguishes this congressional body from the brutal military juntas associated with parts of Chile's twentieth-century history.