 Complete the following phrase:  Mackinnon was born in Strath, Isle of Skye, Scotland. He studied medicine at the University of Glasgow and University of Edinburgh, graduating from Edinburgh in 1851 and receiving an FRCS qualification in 1873. In 1853, he enlisted to the 42nd Regiment of Foot as assistant-surgeon and took part in the Crimean War in Alma, Balaklava and Sevastopol, as well as in the 