Hendry tapped in Liam Kelly's cross after a lovely passing move and it proved enough against a dogged Walsall side.
And a jubilant Williamson said: "I thought we dominated large parts of the game and created a good amount of chances and defended when we needed to.
"Tom (McGill) made one or two big saves for us, but I was just incredibly proud and pleased with the reaction from the other night. We're 1-0 up on the run we're on against a team that have a lot of players that can hurt you all over the pitch with their physicality and who just want to consistently put it in the box.
"Of course we need a bit more composure and that was part of it. It was a relief to get the result. The performance was good, but can be so much better.
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