It was certainly no fluke as Ireland produced a first half in which they created and took their chances.
Matthew Nelson gave them the lead in the first quarter as he was on hand at the back post to deflect a long ball into the circle past the Belgium goalkeeper and into the net.
Irish captain Sean Murray was at the centre of all the good work his side were doing both defensively and in attack.
It was a stick tackle in the circle on Murray that led to a penalty stroke for Ireland that was converted by Lee Cole.
It was a lead Ireland would never relinquish. They created further chances before half-time and after the break were relentless in their defensive work to keep the current number two side in the world at bay.
Eventually they conceded with five minutes remaining when Guillermo Hainaut scored but despite a flurry of penalty corners for Belgium, Ireland held on for a famous victory and three massive points.
After they play again this weekend their next encounter will be on the opening day of the Olympics in Paris in July.