Editing Castle Siege

|image = {{tabber|title1=Ultimate|content1=[[File:SSBU-Castle Siege.png|300px]]|title2=Wii U|content2=[[File:SSB4UCastleSiege.jpg|300px]]|title3=Brawl|content3=[[File:Castle Siege Brawl.png|300px]]}}

|caption = [[File:FireEmblemSymbol.svg|50px|class=invert-dark]]<br>Castle Siege across the series.

'''Castle Siege''' ({{ja|攻城戦|Kōjōsen}}, ''Castle Siege'') is a {{uv|Fire Emblem}} stage in ''[[Super Smash Bros. Brawl]]'', {{forwiiu}} and ''[[Super Smash Bros. Ultimate]]''. It was first revealed for ''Brawl'' at [[E3]] 2006. It is based upon themes and motifs from the series as a whole, rather than one particular title, due to the stage not resembling any game of the series. The stage takes place at an unnamed castle, transitioning between the castle's roof, its throne room and an underground lava cavern.

While the stage is transitioning between segments, it is a temporary walk-off. This can have the effect of saving a character who would have been otherwise unable to recover, as the ground comes from beneath; for example, [[Bowser]] players attempting a stalled [[Flying Slam]] or [[Ganondorf]] players attempting a stalled aerial [[Flame Choke]]. However, players must make sure to move to the center of the stage if it is not transitioning to the throne room, as when the stage is done transitioning, players that are on the sides of the ground will fall rapidly with the ground, easily causing a [[self-destruct]].

In ''Super Smash Bros. Ultimate'', the Ω form and [[Battlefield form]] are set in the first segment of the normal form, and the main platform is similar in design to ''SSB4''{{'}}s Ω form; however, it does not extend below the [[blast line]], and it is resized and reshaped to match {{SSBU|Final Destination}} and {{SSBU|Battlefield}}, respectively. The three [[soft platform]]s of the Battlefield form bear the design seen on the platforms of the second segment, the throne room.

SSBU-Castle SiegeOmega.png|Ω form in ''Super Smash Bros. Ultimate''.

SSBU-Castle SiegeBattlefield.png|Battlefield form in ''Super Smash Bros. Ultimate''.

[[File:CastleOstiaFE.png|thumb|left|Castle Ostia in ''Fire Emblem: The Blazing Blade'' is one of the castles where the large castle in the background of this stage is derived from.]]

With the introduction of the [[stage hazard]] toggle, Castle Siege doesn't transition past the first segment. Because of this, it was proposed as a legal stage during the earlier phases of the ''Ultimate'' metagame.  However, it quickly proved to be controversial due to its asymmetrical layout and small size, as well as the slanted floor giving a disadvantage to projectile-focused characters, and the camera on the bottom right sometimes obstructing the view and hindering recovery and edgeguarding attempts. The stage was legal early on at tournaments such as {{Trn|GENESIS 6}}, but it quickly fell out of favour with it being one of the least played stages in the tournaments where it is legal.

|nlM=Besieged Castle

*If a match on Castle Siege goes into [[Sudden Death]], it will begin on whichever segment the match ended on instead of always starting on the first section. This is likely done so the game doesn't have to reload the top level before Sudden Death.

*In ''Ultimate'', the following [[Assist Trophy|Assist Trophies]] can only appear on the Battlefield and Omega forms of this stage: [[Burrowing Snagret]], [[Color TV-Game 15]], [[Devil]], [[Dr. Kawashima]], the [[Squid Sisters]], and [[Knuckles]]. The [[Moon]], [[Andross]], and [[Nikki]] cannot be summoned on this stage at all, likely due to some of the dark backgrounds.

*In the ''Fire Emblem Heroes''-styled illustration from the [[Smash Bros. Countdown]] depicting Castle Siege, the original flag emblem in the background is replaced with the emblem of the {{s|fireemblemwiki|Askran Kingdom}}.