A father and son have been charged with assaulting a pair of volunteer firefighters who attended a blaze on the outskirts of Melbourne.

The firefighters were called to respond to reports of a fire burning at a property at Bacchus Marsh overnight. A total fire ban was in place at the time.

The two occupants of the home, a father and son, allegedly became aggressive towards the firefighters after they arrived. The firemen sustained minor injuries but did not require hospital treatment.

Police arrested a 22-year-old man and a 47-year-old man on Monday, charging the pair with a number of offences. They were loaded into a police van at the scene.

The younger man has been charged with assaulting an emergency worker on duty, assault, affray and making threats to kill.

He was bailed to face Bacchus Marsh Magistrates Court on March 8. The 47-year-old man has been charged on summons with lighting a fire during a fire danger period, affray, and assaulting an emergency worker on duty. He will face court at a later date.