Attacking structures in EVE Online, such as Citadels, Engineering Complexes, and Refineries, requires thorough preparation, strategy, and understanding of game mechanics. Structures in EVE can be formidable opponents due to their powerful defenses, the ability to house defensive fleets, and repair timers that can draw out the siege. Here are strategies and considerations for a successful structure attack:

1. Understanding Structure Mechanics

• Vulnerability Windows: Structures have specific times when they are vulnerable to attack. Plan your attack during these windows.
• Shield, Armor, Hull: Structures have three layers of defense. Attacks must first breach the shield, then armor, before finally damaging the hull. Each layer must be brought to 0% in separate engagements due to reinforcement timers.
• Reinforcement Timers: When a structure’s shield or armor reaches 0%, it enters a reinforcement phase, becoming invulnerable until the timer expires. Time your attacks to ensure your fleet can commit to subsequent engagements.

2. Preparation and Intel

• Gather Intel: Use scouts to monitor the target structure’s activity, vulnerability windows, and any defensive fleets.
• Understand Defenses: Structures can be fitted with powerful weapons and electronic warfare modules. Know what you’re up against.
• Logistics: Ensure your fleet has repair ships, as prolonged engagements will require sustain.

3. Fleet Composition

• Siege Ships: Dreadnoughts and other capital ships can deal massive damage to structures but are vulnerable to counter-attacks. Use them carefully.
• Subcapital Fleets: Depending on the structure’s size and defenses, a well-organized subcapital fleet can be effective. Include electronic warfare to disrupt the structure’s defenses.
• Support Ships: Logistics for healing, command ships for fleet boosts, and fast attack ships to ward off enemy fleets are essential.

4. The Attack

• Initial Engagement: Begin the attack by focusing fire on the structure to bring down its shield. Use electronic warfare to mitigate incoming damage from the structure.
• Dealing with Counter-Attacks: Be prepared for the defending corporation or alliance to deploy a fleet. Assign a portion of your forces to engage any defenders.
• Reinforcement Phases: Once the shield (or armor in the second attack) is down, the structure will become invulnerable. Regroup, repair, and prepare for the next phase.

5. Final Assault and Hull Timer

• Hull Timer: The last phase of the attack occurs when the structure’s hull is exposed. This is the final battle to destroy the structure.
• All-In: Bring maximum firepower. This is the last opportunity to destroy the structure before it repairs itself, resetting the process.

6. Additional Tips

• Electronic Warfare: Use jammers and disruptors to interfere with the structure’s ability to target and damage your fleet.
• Asset Safety: Be aware that destroying certain structures will send stored assets to safety, imposing a cost on the structure’s owners to retrieve them.
• Escape Plan: Have a withdrawal plan in case the battle turns against you. Preserving your fleet for another attempt can be smarter than a total loss.

7. Post-Destruction

• Loot: Destroying structures can yield valuable salvage and dropped items. Have salvage ships ready.
• Occupation: If your goal is to claim territory, be prepared to deploy your own structures swiftly.

Successfully attacking structures in EVE Online is a significant undertaking that can influence territorial control and alliance power dynamics. Coordination, preparation, and understanding the mechanics are key to achieving victory and minimizing losses.