Lionel Protip Sen

Lieutenant-General Lionel Protip Sen DSO
Nickname(s)	Bogey
Born	(1910-10-20)20 October 1910[1] Calcutta, Bengal Presidency, British India (now Kolkata, West Bengal, India)[2]
Died	17 September 1981(1981-09-17) (aged 70)
Allegiance	British India (1931-1947)  India (1947-1965)
Service / branch	British Indian Army  Indian Army
Years of service	1931–1965
Rank	Lieutenant-General
Service number	AI-77
Unit	16/10 Baluch Regiment 8th Gorkha Rifles
Commands	GOC-in-C, Southern Command GOC-in-C, Eastern Command 161st Indian Infantry Brigade
Battles / wars	World War II Burma campaign Battle of Hill 170 Indo-Pakistan War of 1947 Sino-Indian War
Awards	Distinguished Service Order
Other work	authored Slender was the Thread

Lieutenant-General Lionel Protip "Bogey" Sen, DSO (20 October 1910 – 17 September 1981) was a decorated Indian Army general. He served as the Chief of the General Staff during 1959–1961 and commanded the Eastern Command during 1961–1963. He was the general responsible for countering the Chinese invasion of NEFA during the Sino-Indian War of 1962. Sen is also the author of Slender was the Thread, a military history of the Indo-Pakistani War of 1947–1948.