The Grappler was one of roughly 100 Albacore-class gunboats that the British Admiralty ordered to meet the demands of the Crimean War. Like her sisters, she was completed just as that conflict ended, leaving the Royal Navy with a surplus of small, steam-powered warships designed for coastal operations. When the Fraser Canyon Gold Rush erupted in 1858, sending thousands of fortune-seekers flooding into British Columbia, the Admiralty dispatched the Grappler and a sister ship to help maintain order. She sailed from England in August 1859 and reached Esquimalt nearly a year later, on July 12, 1860, having rounded Cape Horn to reach the Pacific Station.

Under Lieutenant Edmund Hope Verney, the Grappler became indispensable to the Colony of Vancouver Island. Her shallow draft, steam power, and small size made her useful for tasks no larger vessel could manage. At Governor James Douglas's request, she carried those first 35 settlers to Comox and continued serving as the settlement's supply line before any other transport was available. She policed the liquor trade, a persistent problem in a colony where unlicensed whiskey flowed freely to Indigenous communities and settlers alike. She tended lighthouses, laid navigation buoys, and performed rescues along a coastline that was still only partially charted. In a colony with few roads and vast distances, a ship like the Grappler was less a warship than a floating government office.

In 1868, the Royal Navy sold the Grappler out of service. She entered commercial life as a packet steamer, carrying passengers and cargo along the British Columbia coast. The transition from naval vessel to merchant ship was common for the era, though few Albacore-class gunboats survived long enough to make it. The Grappler continued working the same waters she had patrolled as a warship, running between Puget Sound and the Alaska Territory in the years following the American purchase of Alaska from Russia in 1867. Her career spanned the transformation of British Columbia from a remote colonial outpost to a province of the new Canadian confederation.

In April 1883, fire broke out aboard the Grappler during a voyage, and the ship burned and sank with significant loss of life. The details of the disaster are sparse in the historical record, but the event ended a career that had stretched from the Crimean War to the early years of Canadian nationhood. The Grappler had served under both the Union Jack and the Red Ensign, carried settlers and soldiers, delivered mail and supplies, and helped impose order on one of the most remote coastlines in the British Empire. A body of water on the British Columbia coast -- Grappler Sound -- still carries her name, and a watercolour painted in October 1865 by William Edward Atkins, held at the National Maritime Museum in Greenwich, preserves her image.