"We were 2-1 down with a few minutes to go and we simply had to go for it," Boothroyd told TheFA.com after the game.
"Sometimes you make substitutions and they work, and sometimes they don't. On this occasion Chuba came on and scored two great goals.
"But the whole team never gave in and never stopped believing.
"We want to teach them about tactics and the psychological side of things - but there's a lot to be said for downright determination and resilience - and this group has that in abundance.
"And that's why we won the game in the end. We might not have been the better team, but we still won and I'm very pleased."
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