Reykjavik, Iceland — What happens when boatloads of American troops port-call in a small island nation? All the beer runs out.

According to the Icelandic media, the around 7,000 U.S. servicemen, who briefly stayed in Iceland on their way to Norway, drained the whole city dry in just four days (October 24-28). Although the American deployment was well-known in advance, and the people of Reykjavik had been briefed about the arrival of the troops, the beer stock proved wholly inadequate. The situation got so bad that the local bars and pubs had to request emergency support from Iceland’s breweries.

The deployment to Iceland is part of the U.S. contribution to Trident Juncture 18, NATO’s largest military exercise since the end of the Cold War.

“Yes, that was gorgeous. This was an incredible number,” said Nuno Alexandre Bentim Servo, a bar owner. He added that since there will be more than 40,000 allied troops in Norway, Sweden, and Finland for the exercise — and judging by the performance of the small number of Americans that stopped by — it is paramount that additional beer supplies be sent to support the troops.