Rushall had rallied to cancel out goals by Tom Mallinson and Jack Pemberton before Brooks gave Grantham a 3-2 victory.
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2.
Elsewhere, Lincoln United claimed their first home victory of the season in the Unibond First Division South with a 2-1 victory over Rushall Olympic 2-1.
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3.
In the Unibond League Division One South, Danny Brooks' goal three minutes from time sank Rushall Olympic and earned Grantham Town their first victory in six games.