No standalone Battle Brook entry appears in the Region 4 synopsis. Apply the region-wide defaults: no fishing in any stream April 1 to June 14, trout and char catch-and-release in streams November 1 to March 31, single barbless hook year-round, and a bull trout daily quota of one, any size. Confirm the current synopsis at gov.bc.ca before you fish.

NRCan/GeoGratis places Battle Brook's mouth at 50.999444, -117.583889 (key JAWGE), where it joins the Incomappleux River in the Selkirk Mountains. The brook runs stream order 5 (mid-range toward river scale on the 1-to-6+ network) for roughly 17 km, close in size to its neighbour McDougal Creek a little further downvalley.

Provincial fish-inventory data directly confirms rainbow trout in Battle Brook. Bull trout and westslope cutthroat are reachable habitat under barrier-aware connectivity modelling, and dolly varden shows up in the broader habitat read for this drainage too (no dedicated species page exists for that char yet), though none of the three has a direct record on file for the brook itself.

Fish it like a remote Selkirk tributary: short drifts with a buoyant dry over a light dropper for rainbow trout and any cutthroat, the same small-stream dry-fly approach that works across the region's backcountry creeks. Near the confluence with the Incomappleux, work a streamer slow and deep in case a bull trout has moved up from the main river; a 2012 environmental assessment opposing a proposed 45 MW TransAlta hydro project on the upper Incomappleux specifically named blue-listed bull trout habitat extending upstream to Battle Brook's mouth as spawning and rearing water for the Arrow Lakes Reservoir population. That project didn't leave a powerhouse on the river; the Incomappleux remains one of the few undammed drainages left in the Columbia Basin, and much of the same upper valley became the Incomappleux Conservancy in 2023.

No hatch report specific to Battle Brook has turned up. Until one does, fish the general moving-water calendar mined from the wider East Kootenay corridor as a starting point rather than a confirmed local hatch: golden stoneflies into early summer, summer mayflies, caddis from mid-June, and terrestrials as the water drops in August. Start with a Stimulator, small Chubby Chernobyl or Royal Wulff, switch to an Adams or Elk Hair Caddis as fish get selective, and carry Hare's Ear and Pheasant Tail nymphs for the pocket water. Where legal and appropriate around bull trout, a small Woolly Bugger or Muddler Minnow covers the char near the confluence.

Battle Brook sits in the same remote Selkirk valley the province permanently protected as the Incomappleux Conservancy in January 2023, though whether the brook's own confluence falls inside the formal conservancy boundary or in the roughly 17,000 additional hectares kept out of logging around it isn't confirmed. Either way, treat this as old-growth-adjacent, sensitive habitat: the 2012 hydro-project opposition specifically cited the brook's role in a bull trout population researchers already flag as one of the reservoir's more important, so handle any char here with real care.

Battle Brook is reached the same way as the rest of the upper Incomappleux valley: via the Incomappleux Forest Service Road from Beaton, at the head of Upper Arrow Lake's Beaton Arm. That road has been gated to public motorized traffic since 2021 after repeated rockfall damage in the gorge downstream, so plan on a boat-in, foot-in or scouting trip rather than a drive-up creek. No guide coverage specific to Battle Brook was found.