Jethro joins the army reserve & Granny makes him wear her Grandpappy's uniform. When he arrives the sergeant thinks he's an extra in a civil war movie. The Colonel tells him to come back on Monday. Jethro overhears the Colonel talking to an actor dressed as General Grant. He thinks the Yankee's are fixin'to fight with the south again. Jethro tells Granny the news & Granny dresses as a southern belle to spy on Gen.Grant & get information on when the attack will be. Granny learns that Grant is going to attack the Culpepper plantation & hurries off to warn them.

Granny wants an apology from General Grant for attacking the Culpepper plantation. Colonel Blake wants Jethro for the army reserve but he has to take a written test first. After Jethro takes the oath, he sees General Grant & Colonel Blake talking. He hears General Grant say he's going to attack the plantation again. Jethro tells Granny & she goes & shoots him off his horse again.!!

The mansion becomes a mecca for a phony guru (William Mims).