Now the 28-year-old winger will end it with a second Wembley appearance in as many months.
Barnsley’s Hammill heads into the League I play-off final clash with Millwall on Sunday likening the Reds to Premier League champions Leicester City.
The Oakwell side were close to the relegation zone at Christmas.
But 15 wins over the second half of the season hoisted them up to sixth.
Walsall were beaten 6-1 on aggregate in the play-off semi-finals by a side who defeated Oxford United 3-2 at Wembley to win the Johnstone’s Paint Trophy.
And reclamation of the Championship place lost two years ago is now within sight for Paul Heckingbottom’s side.
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The former Barnsley, Bradford City and Sheffield Wednesday defender took interim charge after Lee Johson’s departure to Bristol City in February.
Liverpool product Hammill, who began a second spell at Barnsley in November after leaving Town by mutual consent in September, was part of he squad Heckingbottom inherited.
The former England Under 21 international had off-the-field issues while with Town, for whom he played on loan before a permanent switch from Wolves in June 2013.
This season’s outings fom the bench against Hull City in the Championship and Notts County in the Capital One Cup took his total outings for the club to 75 (54 starts) with seven goals.
After an unfruitful trial at Bolton Wanderers, Hammill joined Barnsley, where he previously played between 2009-11, on a short-term deal.
His personal upturn in fortunes has mirrored that of his team, with bright performances bringing suggestions that former boss Johnson wants to sign him for Bristol City.
“I don’t think it’s quite a Leicester - that’s unbelievable - but we’re not far behind,” said Hammill, who scored his eighth goal since returning in the 3-1 second-leg win at Walsall.
“But the job is nowhere near complete. We need to go to Wembley, be victorious and get back into the promised land, which is the Championship.
“Each and every single one of the players in the changing room wants to test themselves at the highest level and there’s no better chance than to go to Wembley and prove why we deserve to be there.
“I’ve said before we were in a false position when I came in. The team is full of talented players but needed a bit of experience to blend it.
“Thankfully we brought a few more players in and we’ve excelled and kicked on from there. We’ve hit a good patch of form and long may it continue.”