Area Defense Jingyu Valley Level 1 Guide for the Early Warning Terminal in Arknights: Endfield. See strategies for Auto Defense, Operator Intervention, and facilities to use.
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Jingyu Valley Level 1 Auto-Defense Guide
- Can be Cleared Using HE Grenade Tower and Marsh Gas MK-1
- Focus on Adding Facilities at the Southern Area
- Concentrate Facilities at the Merge Point
Use HE Grenade Tower and Marsh Gas MK-1

Auto-clearing is possible with a combination of the "Marsh Gas MK-I" and "HE Grenade Tower," which can be crafted in Wuling. They are unlocked by progressing Wuling's AIC Plan, so first explore Wuling to collect AIC Tech Indexes.
Place Weapons in the Southern Area

While the Marsh Gas and HE Grenade combination can defeat most enemies, the Quillbeast are troublesome as they might break through. You can prevent them from getting past by concentrating your Facilities to surround the entire southern area.
The Quillbeast Moves at High Speed

The Quillbeast rolls and moves at high speed towards the Command Core. They have a lot of HP and can't be stopped without any countermeasures, so they may break through. Counter them by placing many Facilities on the Quillbeast's invasion route.
Concentrate Weapons at the Merge Point

By focusing on placing Facilities where enemy paths merge, you can attack multiple enemies at once. In this stage, the invasion routes overlap on the south side of the map, so focus your Towers there.
Jingyu Valley Level 1 Operator Intervention Guide
- 2 HE Grenades and 1 Marsh Gas MK-1
- Prioritize Defeating the Boss In Operator Intervention
- Effectively Stop Enemies with Solidification
2 HE Grenades and 1 Marsh Gas MK-1

In Operator Intervention, we recommend deploying sets of two "HE Grenade Towers" and one "Marsh Gas MK-1 " in 2 separate locations. You can defeat most enemies by placing them where enemy paths converge, but be sure to have your characters wait near the Facilities.
Prioritize Defeating the Boss In Operator Intervention
The Quillbeast moves by rolling at high speeds, so there will be times when you can't defeat them with your Facilities alone. You can easily defeat them by attacking with your characters near the installations to draw their aggro and stop their movement, so make them a priority target.
Effectively Stop Enemies with Solidification
Applying Solidification to normal enemies can stop them for a longer duration. In this stage, this is a reliable way to stop the rolling Quillbeast, so if your characters are enhanced enough, try using a Solidification Build.