# Foundry Battle

Source page: https://wos.sheet.guide/en/guides/battles/foundry-battle  
Last checked: 17 Oct 2026  
Unofficial fan site, not affiliated with Century Games. Numbers, unlock days and event rules change with patches and differ between states; treat them as rules of thumb and confirm in-game.

Part of: [Alliance Battles](https://wos.sheet.guide/en/guides/battles.md)

A one-hour alliance-vs-alliance battle on its own map, scored by controlling buildings.

**TL;DR:** Get into a legion, be on time, and hold buildings, the **Imperial Foundry** above all. Your troops come back afterwards, so play aggressively.

## Key facts

- **When:** About every 2 weeks
- **Battle:** 1 hour
- **Who:** Top-20 alliances by power
- **Teams:** Up to 2 legions × (30 + 10 subs)

## Timeline

| Stage | Length | What happens |
| --- | --- | --- |
| Voting | 2 days | Every member votes on a battle time. R4/R5 pick the final slot from the results. |
| Registration | 2 days | Leaders pick up to 30 combatants + 10 substitutes per legion. Join the alliance before this ends. |
| Matchmaking | 2 days | You’re paired with an opponent by voted time and Alliance Power. |
| Battle | 1 hour | Phase 1 buildings open first. Phase 2 adds the Imperial Foundry, Munitions Warehouse and Mercenary Camp. |

Note: From the official help center. To qualify, your alliance must be top 20 on the state Alliance Power leaderboard before voting starts.

## Buildings & points

| Building | First capture | Per minute | Notes |
| --- | --- | --- | --- |
| Imperial Foundry | 9,000 | 1,800 | The main prize. Hold it. (Phase 2) |
| Prototype Site | 6,000 | 1,200 | Second priority. (Phase 1) |
| Repair Facility | 3,000 | 600 | Corner buildings. Easy early points (Phase 1) |
| Boiler Room | 1,200 | 240 | (Phase 1) |
| Transit Station | 1,200 | 240 | (Phase 1) |
| Munitions Warehouse | 1,200 | 240 | **+15% troop damage** (Phase 2) |
| Mercenary Camp | 1,200 | 240 | Enables strike teams (Phase 2) |

Note: Values from community trackers; the same buildings and values appear in the Tundra Arms League Foundry tournament. Weapon Workshops also spawn at random later in the battle.

## Scoring

The alliance with the most **Arsenal Points** at the end wins. Points come from **first captures**, **holding** buildings over time, **Arsenal Supplies**, **Weapon Workshops** and defeating enemies (one tracker lists 80 points per 10,000 enemy power).

Personal points only affect your own rewards, not who wins. Holding beats trading: one building held for the whole hour outscores several quick captures.

## Strategy

- **No permanent losses**: injured troops recover after the battle, so commit fully.
- Grab the Phase 1 buildings fast, then **park teams next to the Imperial Foundry** before Phase 2 opens.
- Coordinate both legions: decide who attacks, who garrisons and who rallies.
- React fast when points drop on a building you hold. Reinforce first, retake second.
- Leaving the battlefield triggers a **re-entry cooldown**, so don’t step out casually.

## Rewards

Personal **Arsenal Points** are spent in the **Arsenal Shop** on hero shards and gear materials.

The winning alliance gets bonus resources and items on top.

## Related

- [Canyon Clash](https://wos.sheet.guide/en/guides/battles/canyon-clash.md)
- [Alliance Championship](https://wos.sheet.guide/en/guides/battles/alliance-championship.md)
- [Fortress & Stronghold Battles](https://wos.sheet.guide/en/guides/battles/fortress-battles.md)