Dictionary of Nautical Terms
A proportion of troops specially assigned to the clearing (from natural impediments) the way for the main body; hence, used generally in the works of an army, its scavenging, &c. Labourers of the country also are sometimes so used.
Military Dictionary and Gazetteer
Are soldiers sometimes detailed from the different companies of a regiment and formed under a non-commissioned officer, furnished with saws, felling axes, spades, mattocks, pickaxes, and bill-hooks. Their services are very important, and no regiment is well fitted for service without pioneers completely equipped. In European armies there are a certain number of pioneers to each regiment.
The numerical value of pioneers in Chaldean Numerology is: 9
The numerical value of pioneers in Pythagorean Numerology is: 2