Dozens of rescuers using two helicopters had to extract the 99 students aged 12 to 14 and eight teachers Tuesday after the path they were on became increasingly difficult and it started to rain, they said.
Two pupils within the group, from the southwestern German city of Ludwigshafen, had slipped, suffering minor injuries, and some were panicking, a police statement said.
The teachers alerted the emergency services.
Police said the group had checked online and had believed the trail in Vorarlberg state in western Austria would be easier than it turned out to be.
"Due to a query in an internet search engine, the teaching staff decided on a route that was no longer signposted," police said in the statement.
The challenging route was "described on the internet as a classic after-work tour", it added.
"The path is no longer in official tour guides... it was relatively difficult and exposed," state police spokesman Wolfgang Duer told AFP.
"The unusual part was the amount of people having to be rescued."
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