The duke and duchess were at The Heart, a centre for digital and tech start-ups in Warsaw.
The rest of the crews were made up of local amateur rowers from Heidelberg and its twin city Cambridge.
Many are viewing the royal trip, taken at the request of the Foreign and Commonwealth Office, as another Brexit diplomacy tour, helping to maintain and strengthen the UK's relations with Europe as it leaves the EU.
Hard to forget, she also donned a forest green bird printed midi-length dress with a high neckline from the German designer Markus Lupfer's Pre-Fall 2017 collection on Thursday.
The Duke's crew emerged victorious, but both teams - and their royal captains - were given medals in a ceremony after the race.
"It's my first rowing medal".
"I was laughing and could not focus on my rowing", he said.
The royals will conclude their tour of Poland and Germany on Friday, one day ahead of Prince George's 4th birthday.
William, second in line to the British throne, and Catherine took a lesson in pretzel-making from apprentices and also made colourful sweets during the visit, which is taking place as Britain negotiates its exit from the European Union. "George is more laid-back", the source reportedly said.
The cookery lesson was held in the city's historic marktplatz, where stalls celebrating local produce from beer to candies were on display.
Though Twitter users went insane over the suggestion the royals might add another child to their adorable brood, Murphy doesn't think that means Middleton wants another prince or princess.
The pair first visited the German Cancer Research Institute, where they were updated on the work being done to combat leukemia.