[220] Unless otherwise noted, this section is based on the following sources: GHQ, FECOM, _Order of Battle Information, Chinese Third Field Army_ (1 Mar 51) and _Chinese Fourth Field Army_ (7 Nov 50); 164-MISDI, ADVATIS, and ADVATIS FWD rpts in EUSAK _WDs_, _passim_; X Corps _PIRs_; 1stMarDiv _PIRs_; 1stMarDiv _SAR_, 30; G-2 _SAR_, 16–18; Far East Command, Allied Translator and Interpreter Service (ATIS), _Enemy Documents, Korean Operations_, _passim_; Fleet Marine Force Pacific (FMFPac), _Chinese Communist Forces Tactics in Korea_, 5–11; Maj R. C. W. Thomas, “The Chinese Communist Forces in Korea,” _The Army Quarterly_, Oct 52 (digested in _Military Review_, xxxii, no. 11 (Feb 53), 87); LtCol Robert F. Rigg, _Red China’s Fighting Hordes_ (Harrisburg, 1951); Walker: _China Under Communism_. This organization comprised a general staff section, a rear Services section and a general political bureau. Largest CCF administrative unit was the field army, which reported directly to Headquarters. Composed of two or more army groups, the field army had a small headquarters of its own. The army group, as the largest unit encountered by UN forces, was comparable to an army in the American military system. CCF army groups in Korea consisted of two to four armies with an average total strength of 60,000–120,000 troops. Equivalent to an American corps was the CCF army, an organization including three infantry divisions and an artillery regiment. Thus the average strength of a CCF army was about 30,000 men. The CCF infantry division, with a paper strength of 10,000 men, averaged from 7,000 to 8,500 men in Korea, according to various estimates. Triangular in organization, it included three infantry regiments and an artillery battalion. Divisional units consisted of reconnaissance and engineer companies of about 100 men, a 150-man transport company, a 100-man guard company, and a 60-man communications company. Transport companies had only draft animals and carts, since little motor transport was organic to a CCF division at that time. The CCF infantry regiment, averaging about 2,200 men in the field, broke down into the following units: three infantry battalions; an artillery battery of four to six guns; a mortar and bazooka company; a guard company; a transportation company; a medical unit with attached stretcher personnel (often composed of impressed civilians) and a combined reconnaissance and signal company. The CCF infantry battalion, with an authorized strength of 852 men and an actual strength of perhaps 700, consisted of a mortar and machine gun or heavy weapons company, a signal squad, a medical squad and a small battalion headquarters in addition to the three rifle companies of about 170 men each. Each of the latter was composed of a headquarters platoon, a 60mm mortar platoon and three rifle platoons.