Incident at Hiyoshi Pass is a short Act 1 side tale on the bridge into Hiyoshi Springs. Mongol archers have pinned down a wounded boy named Banta, and you clear them so his family can cross. It rewards a Charm of Unyielding I.
Part 47 of 66 in Tales of Tsushima
A rumor says Mongols have seized the bridge into Hiyoshi Springs. Go near the bridge over Hiyoshi Pass and you hear shouting.
The Mongols hold the bridge into Hiyoshi Springs, cutting off the ravine. A family tried to cross, and archers wounded Banta. His uncle tells you the archers are waiting for the family to step out and help him.
Find the bridge, kill the Mongol archers to rescue Banta, then speak with his uncle.
Do not walk onto the bridge to reach Banta first. Hunt the archers below, since they are the whole threat.
The Past Never Passes
The Past Never Passes is Ishikawa Tale 3 of 9, an Act 1 side tale in Hiyoshi. Tomoe's archers have ringed Hiyoshi Springs ahead of a Mongol attack, and you scout the area with Ishikawa and clear bridges along the coast. It rewards the Charm of Precision and 2 Silk.
The Way of the Bow
The Way of the Bow is Ishikawa Tale 4 of 9, the last Act 1 part of his storyline, where you defend Hiyoshi Springs from Tomoe's attack. It is worth doing early because it gives you the Flaming Arrow, plus the Charm of Immunity and the Storming Falcon vanity gear for your half bow.
The Curse of Uchitsune
The Curse of Uchitsune is a Hiyoshi Mythic Tale in Izuhara, where you search for a legendary archer's cursed bow. Finishing it gives you the Longbow, the longest-range weapon in the game, plus Explosive Arrows.
A Healer's Touch
A Healer's Touch is an Izuhara escort tale where you guard Hanaoka, a monk healer, on his way to a sick camp in the woods. It has investigation stops and small fights, and pays a Charm of Divine Healing I.