The CGS Petrel was a small Canadian Government Ship that patrolled the upper Great Lakes, from 1892 to 1904.[1][2][3]
Her main duties included fishery patrol.
On August 12, 1903, the Petrel fired upon an American fishing vessel, the Silver Spray, that appeared to be fishing in Canadian water, off Long Point, in Lake Erie.[4][5][6]
A number of shots hit the Silver Spray, and one American crew member was injured.
The Silver Spray evaded capture.
Her captain would later claim she wasn't fishing in Canadian waters, that some of her nets had come adrift, and had drifted into Canadian waters.
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Thomas E. Appleton. USQUE AD MARE: A History of the Canadian Coast Guard and Marine Services, Canadian Coast Guard, 2013-06-24. Retrieved on 2014-05-18. “The Petrel was built for Great Lakes fisheries protection. Proving too slow to cope with American fishing tugs, she was transferred to the Atlantic coast about 1904 on the grounds that she was fast enough to deal with schooners. The Vigilant took over the Great Lakes work.”