 Lachlan , the seventeenth chief of Clan Maclachlan played a part in the Jacobite Rising of 1745 , and lost his life leading the clan at the Battle of Culloden . Lord President Duncan Forbes estimated that the Maclachlan force of that time was about 200 men . In 1748 , Rev. John MacLachlan of <unk> , in a letter to Rev. Robert Forbes , wrote , 
