This semi-last tie at Kingsmeadow was sufficiently over inside thirty minutes, as we got on various occasions to leave the Hammers thinking about what had hit them.
Without a doubt, only three minutes were on the clock when Harder opened the scoring and it was an extraordinary wrap up by the past Wolfsburg forward, who took a pass from Ji So-Yun in her progression and cut the ball past Mackenzie Arnold.
The visitors were just about sorting out some way to remain mindful of Emma Hayes' side, anyway a few mistakes from their Australian goalkeeper changed a by and large troublesome undertaking into a mountain to climb.
Regardless, she allowed a hypothetical long-range effort from Sophie Ingle to wriggle under her body, before acquainting the ball with Harder inside the discipline district to make it 3-0 to the Blues.
Two minutes after the Dane's second of the evening, we were four targets to the incredible, and this was the pick of the group. Ingle was incorporated again, playing in Fran Kirby down the advantage and her low cross was ended in at the near post by Bethany England.
The result was never in vulnerability, anyway the Blues put the seal on an extraordinary feature in the second half when Kirby got the target her introduction had legitimized, netting at the second undertaking after her basic effort was saved.
That was followed late on by a staggering strike by Harder, who cut in from the left and whipped in a shot at the near post that inferred she'd get back the match-ball unprecedented for a Chelsea shirt, similarly as moving her on to nine goals for her new club this season.
The Blues will as of now scramble toward Watford's Vicarage Road on Sunday 14 Stroll for the 10th Terrain Gathering Cup last, when we'll defy Bristol City or Leicester City acknowledging we are conceivably 90 minutes from holding the prize we won suddenly last season.