Four goblins. Two will use a scimitar and shield, and two will use shortbows. They use the average value for hit points.

• Starting position of Ranged and Melee enemies, and the PC (each space is a 5-foot square):

RM.....MR
.........
.........
.........
.........
.........
.........
....P....

• May be any level (1-20) though I'm interested in the lowest level character that can pull this off.
• LMOP takes place in the Forgotten Realms, so I'm going to limit sources to FR-specific and setting-agnostic official hardcover books: Player's Handbook, Monster Manual, Dungeon Master's Guide, Sword Coast Adventurer's Guide, Volo's Guide to Monsters, Xanathar's Guide to Everything, and Mordenkainen's Tome of Foes.
• Customizing ability scores, variant human, multiclassing, feats, and playing on a grid are allowed. All other variant rules are not.
• No magic items or magic item-like things granted by the DM (boons, blessings, charms, etc.)
• Spells/abilities you use before combat may only target you or creatures you control. Only spells/abilities whose effects last 8 hours or longer will still be active when combat starts. You do not get a rest between using any spells/abilities and combat starting.

Four goblins. Two will use a scimitar and shield, and two will use shortbows.

• The enemies use the average value for hit points.
• Starting position of Ranged and Melee enemies, and the PC (each space is a 5-foot square):

RM....MR
........
........
........
........
........
........
....P...

• May be any level (1-20), though I'm interested in the lowest level character that can pull this off.
• LMOP takes place in the Forgotten Realms, so I'm going to limit sources to FR-specific and setting-agnostic official hardcover books: Player's Handbook, Monster Manual, Dungeon Master's Guide, Sword Coast Adventurer's Guide, Volo's Guide to Monsters, Xanathar's Guide to Everything, and Mordenkainen's Tome of Foes.
• Customizing ability scores, variant human, multiclassing, feats, and playing on a grid are allowed. All other variant rules are not.
• No magic items or magic item-like things granted by the DM (boons, blessings, charms, etc.)
• Spells/abilities you use before combat may only target you or creatures you control. Only spells/abilities whose effects last 8 hours or longer will still be active when combat starts. You do not get a rest between using any spells/abilities and combat starting.

• When combat begins, the enemies are exactly 30 feet away from the PC. Any PC-controlled creatures start as close to the PC as possible. All participants start on the ground.
• Two of the enemies (one melee and one ranged) are on each side of the road.
• The enemies have a chance to gain surprise. There is sufficient cover to try to hide on both sides of the road.
• The two melee enemies will close in. If it becomes clear that they can't get into range, they may use an Action to doff their shields and switch to bows.
• Ranged enemies will try to stay within 80 feet (the normal range of their weapons).
• The PC has beat the encounter if they are alive when combat ends and all of the enemies are dead.

• Starting position of Ranged and Melee enemies, and the PC (each space is a 5-foot square):

RM.....MR
.........
.........
.........
.........
.........
.........
....P....

• Any PC-controlled creatures start as close to the PC as possible. All participants start on the ground.
• The enemies have a chance to gain surprise. There is sufficient cover to try to hide on both sides of the road.
• The two melee enemies will close in. If it becomes clear that they can't get into range, they may use an Action to doff their shields and switch to bows.
• Ranged enemies will try to stay within 80 feet (the normal range of their weapons).
• The PC has beat the encounter if they are alive when combat ends and all of the enemies are dead.