Jon-Allan Butterworth becomes Britain's first serviceman injured in Iraq to win gold and everything else you missed overnight at the Paralympics

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Great Britain's Paralympians on day four won 21 medals - eight gold, six silver and seven bronze - on Super Sunday in Rio. The rowers led the way with three gold medals from four finals at Lagoa, before two more in track cycling, two in athletics and one in the swimming pool.

It took ParalympicsGB's overall tally to 56 medals, 23 of them gold.

Here's what else you missed overnight...

Rachel Morris started Britain's golden day with victory in the arms-shoulders single sculls.

Rachel Morris
(Andrew Matthews/PA)

One hour later and the mixed coxed four team of Pamela Relph, James Fox, Daniel Brown and Grace Clough, plus cox Oliver James, made it three golds and one bronze from four finals.

Lauren Rowles and Laurence Whiteley won the double sculls after Morris added rowing gold to her road time-trial win in cycling eight years ago. Tom Aggar took bronze in the corresponding men's event.

There was a significant gold for Jon-Allan Butterworth as he became the first Briton injured in the Iraq or Afghanistan conflicts to claim a Paralympic title.

Jon-Allan Butterworth, Jody Cundy and Louis Rolfe
(Adam Davy/PA)

Butterworth - who was part of a C1-5 mixed team sprint squad with Jody Cundy and Louis Rolfe - was working as a weapons technician in Basra when he was injured in a rocket attack and had to have his left arm amputated.

David Henson, a double amputee after being injured while serving for the Royal Engineers in Afghanistan, added bronze behind Richard Whitehead in the T42 200 metres on the athletics track.

Whitehead successfully defended the title he won at London 2012 for Britain's seventh gold of the day.

Richard Whitehead
(Leo Correa/AP/PA)

The 40-year-old from Nottingham claimed a dominant win, with Henson third. Joanna Butterfield added gold in the F51 club throw, while six-time gold medallist David Weir began his fifth Paralympic campaign by qualifying for Monday's T54 400m final.

Weir became a father for the fourth time earlier in the day as partner Emily gave birth to the couple's son Lenny in the UK.

Lora Turnham and her pilot Corrine Hall also won track cycling gold - eight of Britain's 12 medals over the four days of competition were gold - in the tandem 3km pursuit.

Lora Turnham with pilot Corrine Hall
(Adam Davy/PA)

Sophie Thornhill and her pilot Helen Scott took bronze. Neil Fachie and his pilot Peter Mitchell took silver in the tandem 1km time-trial.

Triathlon world champions Lauren Steadman (PT4) and Alison Patrick (PT5), with her guide Hazel Smith, had to settle for silver. Melissa Reid and her guide Nicole Walters took PT5 bronze.

Bethany Firth claimed her second gold of the Rio Games and third in all with victory in the women's S14 200m freestyle, with Jessica-Jane Applegate taking silver in defence of her title.

Bethany Firth
(Andrew Matthews/PA)

They were two of seven medals for Britain's swimmers as Rebecca Redfearn (SB13 100m breaststroke), and Tom Hamer (men's S14 200m freestyle) also claimed silver and Josef Craig (men's S8 100m freestyle), Stephanie Millward (women's S8 100m freestyle) and Amy Maren (SM9 200m individual medley) claimed bronze.