Anthony Ramesh took a pass from Santu Subba from right flank and scored in the 38th minute to give the Indian Army, Kolkata 1-0 lead.
The score line stood 1-0 in favour of the armymen at the half-time.
In the second half, the RCF, Kapurthala tried hard for equaliser, but all their efforts went in vain even as the Indian Army, Kolkata, tightened its vice-like grip on the match with the midfielder Lallueu Mawia scoring a solo goal in the 49th minutes to double his team's lead.