Evony Port Swap Guide: Baiting Enemy Attacks into a T1 Trap

To execute a port swap in Evony Server vs Server (SvS), you replace an unbubbled alliance bait keep with a prepared Tier 1 (T1) trap castle just seconds before an enemy strike hits. The bait account vacates the coordinate, and the trap immediately claims the exact tile with an Advanced Teleport. Because the attacker has committed march speeds and cannot react in time, their offensive march collides directly with your reinforced defensive wall.

Core Setup: Trap Mechanics and Preparation

A successful port swap relies on combining massive Tier 1 troop volume with subordinate city debuffs to withstand high-tier offensive rallies or solo strikes.

Component	Tactical Function	Operational Requirement
T1 Meatshield	Absorbs offensive strike damage through volume	Massive layer of Tier 1 mounted or ground troops
Wall General	Buffs in-city survivability and base combat stats	Defense-focused general using flat attribute refines
Subordinate Cities	Slashes incoming enemy attack and defense buffs	Full roster of mayors equipped with debuff gear
Advanced Teleport	Instantly relocates the trap onto the bait's tile	Stockpiled alliance shop items or purchased gems

Debuffs provide the defensive baseline for the trap. Attacking players running Tier 14 or Tier 15 marches bring steep offensive percentage multipliers. Equipping subordinate city mayors with debuff gear reduces enemy attack and defense values. Without those high attack multipliers, the attacking march cannot break through the raw health pool of the massive T1 front line before your in-city ranged and siege units wipe out the incoming march.

Step-by-Step Port Swap Execution

Precise timing prevents the attacker from using a March Recall while ensuring the bait keep does not take damage.

Station the bait: Place an unbubbled, low-power alliance member or alternate account on the map with enough apparent resources or vulnerability to attract an enemy solo attack.
Track the incoming line: Monitor the attacker's march timer and line progression. The trap player opens an Advanced Teleport prompt with the bait's exact map coordinates already entered.
Vacate the tile: When the incoming march is roughly two to four seconds from impact—inside the attacker's realistic reaction window—the bait player activates an 8-hour Truce Agreement or uses a Random Teleport to leave the tile.
Confirm the teleport: The trap player immediately confirms the Advanced Teleport. The game engine resolves the active march against the trap keep now occupying the destination coordinate.

Defensive Readiness Checks

Before jumping onto the target tile, the trap player must verify several in-city combat settings:

Subordinate city toggles: Open the Subordinate City overview and verify that "Automatic fight" and "Accept defense" are toggled on. If these settings are disabled during a teleport, mayors will not join the battle, stripping away all gear debuffs.
In-city combat buffs: Activate defense buffs, attack buffs, and in-city HP enhancements prior to teleporting.
Anti-scout activation: Keep Anti-Scout running on the trap account. If an attacker attempts an immediate scout right before impact, the hidden stats prevent them from spotting the switch.

Risk Factors to Monitor

Network latency presents the largest failure risk during a swap. A split-second lag spike can leave the bait account exposed to the hit or place the trap onto the tile after the march has already resolved. Coordinating over direct voice communication ensures both players execute their moves in lockstep.

Finally, confirm the incoming march type before committing to the swap. Port swaps target solo speed marches from players hunting unprotected keeps. If the enemy organizes a multi-player alliance rally, do not take the hit unless your defense is specifically built to handle full rally damage. Against solo strikes, the exchange inflicts permanent high-tier troop losses on the attacker while keeping your own revival costs low.