EL JAISH overcame initial jitters before beating Al Ahli 26-28, 25-10, 25-23, 25-15 in a Qatar League tie last week.
In the match held at Al Arabi Sports Club, Jaish were expected to roll over their opponents.
But Ahli took the first set which went down to the wire, but Jaish were quick to regroup and took the second 25-10.
They then won a close third set and sealed the contest in the fourth with relative ease.
Polish recruit Jakub Jarosz, who replaced seasoned campaigner Christian Pampel at the beginning of the season, was the architect of Jaish’s triumph with his power-packed smashes.
The 29-year-old, a member of Poland’s triumphant 2012 World League team, gelled well with Youssef Alghaf and Milos Stevanovic.
He is proving to be a good acquisition for the Armymen, who are mounting a serious title challenge this time.
Meanwhile, Qatar SC fought back after losing the first set to quell the challenge of Al Gharafa 15-25, 25-19, 25-22, 25-17.
Police beat Al Wakrah 29-27, 25-12, 25-2 and Al Shamal had it easy against Al Sadd 25-20, 25-23, 25-19.