Rovers have got the better of Leeds 2-1 at Ewood Park in the Championship.
Armstrong started the match and played for the entire 90 minutes, and the former Newcastle United striker played well.
The 21-year-old striker has taken to Twitter to express his delight at the win for Blackburn against Leeds.
The England Under-21 international - who joined Blackburn from Premier League club Newcastle in the summer transfer window for a fee reported by Sky Sports to be worth £1.75 million - has also described Leeds as a “top side” - which should encourage the fans of the Elland Road outfit.
Armstrong’s tweet shows just how he delighted he is that Blackburn won at Ewood Park, and it is a compliment to Marcelo Bielsa’s side that winning against them means so much for an opposition player.
Fantastic win today against a top side! Lads were excellent throughout! Happy to have got man of the match! Onto Tuesday now!— AdamArma (@AdamArma9) October 20, 2018
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