 During this time Chief Archibald MacTavish was sympathetic to the Jacobite cause but took no action to support either the Government or the Jacobites.Chief Archibald is said to have signed the address welcoming the Pretender, James Stewart, King du jour in Exile.In 1745 both Chief Archibald and Dugald MacTavish, the Younger, were imprisoned at Dumbarton Castle, in September 1745 during the 1745 Jacobite Rising.