Roman dictator Cincinnatus was plowing his field when he was made dictator. He resigned and returned to his farm after 16 days.

Cincinnatus was a Roman senator at the time that he was chosen to be dictator. Some other senators went to see him to inform him of the news. At the time, he was working on his farm and plowing his fields. 

He called out to the approaching senators, asking if everything was all right, and they responded "it might turn out well for both him and his country.” The senators told Cincinnatus that he should go get his senator’s toga. His wife Racilia brought his toga out to him. 

It was only after Cincinnatus had put on his toga that the senators told him that he had been chosen as dictator. Cincinnatus traveled with them to meet the other senators and his sons across the Tiber river. He appointed several leaders as dictator, including Lucius Tarquitius as his second in command. 

Tarquitius was put in charge of the cavalry and Cincinnatus took control of the infantry. They took their enemies by surprise in the Battle of Mons Algidus. Cincinnatus chose not to completely take out their enemy, the Aequi, accepting conquering them as enough. 

After just 16 days, Cincinnatus had won the battle and disbanded the army. He resigned his job as dictator and returned to town.

(Source)