Eddie Nketiah scored a brace, while Jeff Reine-Adelaide and Vlad Dragomir were also on target as Arsenal swept aside Manchester United at Meadow Park.
Reine-Adelaide did open the scoring, sliding the ball in from close range after ghosting in from the left-hand side.
Despite this we scored next, this time through Dragomir, who placed the ball in the bottom corner after having been slipped through by Nelson.
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Keen to get back into the game, the visitors upped the tempo and very nearly reduced the deficit through Aidy Barlow, who saw a header bound for the top corner saved spectacularly by Macey.
As the full-time whistle neared, Nketiah turned with speed and strength on the break, capping off a fine run with a composed finish to stretch the Gunners lead to three.
Nketiah after his first goal registered a second to put the icing on the cake for Arsenal.