23 Punjab Regiment of the Indian Army.
Battle of Longewala in 1971, a company of around 120 with just 2 recoiless rifles held out an outpost, with no minefield or artillery, against a Pakistani force of over 2000 troops and atleast 50 tanks, untill air support could come in.
Mauryan forces under Chandragupta (322-298BC) and his successors.
Forces overran almost all of South Asia. (Expansion stopped because of Emperor Asokas conversion to Buddhism). Gained control of ex-Persian territories, including large areas of Aghanistan and bits of Iran, through war and treties with Seleucus Nicator, Alexander's heir to the Greco-Bactrian areas.