[1] In 1846, while a lieutenant of the 66th Regiment of Bengal Native Infantry, Strachey explored the Tibetan regions surrounding Lakes Manasarovar and Rakshastal.
He found a channel between the lakes, suggesting that Manasarovar, and not Rakshastal, was the source of the Sutlej River.
[4] In 1847 Strachey was appointed to a boundary commission of Jammu and Kashmir led by Alexander Cunningham.
[6] Strachey's Tibetan surveys won him the Royal Geographical Society's Patron's Medal in 1852.
[8] On 6 September 1859, by this time a captain of the 66th Goorkha Regiment of Bengal Native Infantry, he married Joanna Catherine, daughter of Rudolphe Cloete, of Newlands, Cape Town, South Africa.