A 300-Swarmer Horde at Chemult that you clear in You Alone I Have Seen, Captain Kouri's field test of Weaver's Napalm Molotov. It is not the free-roam Chemult Station Horde, which is a separate 125-Swarmer target.
This is the fight built to show off napalm, so lean on it. Throw it where the Horde bunches up, then back away and let it burn. Keep regular Molotovs and explosives as backup for the gaps between throws.
Hordes bed down somewhere dark during the day and move out at night to feed and drink. Scout the area in daylight while it sleeps, then pick when to start the fight. If you only need to pass through, give its route a wide berth after dark.
The test works, and Kouri talks about the officers' mess afterwards. Back on the island, Weaver and Sarah end up locked in a cave, which pushes Deacon to plan her escape.
Chemult Station Horde
The Chemult Station Horde is a 125-Swarmer Horde Killer target living in a derailed NERO body train at Chemult's rail station. It opens after A War We Can Win and pays Diamond Lake.
Big Mountain Travel Center
Big Mountain Travel Center is a truck stop in Chemult on Highway 97. It has no mission of its own. Chemult is still worth a scavenging run if you keep clear of the Horde at the train station.
Brick Oven Pizza & Pub
Brick Oven Pizza & Pub is a pizza place and bar in Chemult on Highway 97. It has no mission of its own. Chemult is still worth a scavenging run if you keep clear of the Horde at the train station.
Chemult Community College
Chemult Community College is a walled campus near Chemult and the biggest site on Highway 97. It stays sealed until the story mission So Many Of Them, then holds a NERO checkpoint, an infestation and a Horde.