The east Londoners kicked off their pre-season programme with a comfortable win over League of Ireland side Cork City at Turners Cross where six different scorers netted
It didn't take long for the Hammers to show their Premier League pedigree, with French midfielder Diarra heading home a fifth minute corner kick following an impressive start from Matt Jarvis. The hosts were struggling to create chances of their own, with Danny Furlong's off-target their best early opportunity.
A pinpoint pass from Kevin Nolan to Cole allowed the England international to finish past the onrushing Kevin Burns, as West Ham began to dominate. However, the Leesiders only went in a goal down at the break thanks to a strike from Rundle, who needed two attempts to beat Jussi Jaaskelainen.
Both teams came out with almost completely different lineups for the second-half, and West Ham's strength in depth shone through once again. Just half a minute into the half, the visitors were awarded a penalty when Morrison went down in the area, but Noble saw his spot kick palmed away by Burns.
West Ham continued to get men forward, and added to their tally on 62 minutes when Taylor fired home from distance. A cross from Danny Whitehead for McCallum saw the Hammers go three ahead, and a minute later Noble made up for his earlier penalty miss by sending Burns the wrong way after a handball by John Kavanagh.
Five minutes from time, West Ham added a sixth when McCallum pulled the ball back for Morrison, before teenager Lehane got on the scoresheet for the hosts after fine work from new signing Ciaran Kilduff.
The Hammers return to England to play Boreham Wood in their next pre-season friendly, while Cork will be hoping for better results in the rest of their summer friendly schedule, as they take on Burnley, Celtic, and West Bromwich Albion.