Armstrong got his side's second, before Jim O'Brien scored a late winner to maintain Coventry's perfect start to the season.
Another great win against Crewe! Lads were amazing again!! Fans were quality to! Glad to have grabbed another goal! #PUSB
— AdamArma (@AdamArma9) August 18, 2015
The 18-year-old now has five goals in his first three games this season, with the Sky Blues currently sitting pretty on top of League One.
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