Transferring Unit Control

RogerCooper

I am working on a mod where major powers gain control of unaligned nations through random events. For example

<attachment name="triggerAttachmentSpainUnited_States" attachTo="United_States" javaClass="games.strategy.triplea.attachments.TriggerAttachment" type="player">
<option name="conditions" value="conditionAttachmentEveryTurn"/>
<option name="players" value="United_States"/>
<option name="chance" value="1:80"/>
<option name="chanceIncrementOnFailure" value="1"/>
<option name="when" value="before:United_StatesPurchase"/>
<option name="changeOwnership" value="Spain:Non_Aligned:United_States:false"/>
<option name="uses" value="1"/>
</attachment>

Is there any way to change the ownership of the units directly. I would rather avoid having to specify for each territory removing each unit and adding a new units.

beelee

@rogercooper

Hi Roger

What I did was a little different as I had all units from all their TTys change at once and I don't remember 100% of how I did it but you already have the "changeOwnership" .

You need to use "GiveUnitControl" and then specify the TTy. So you'd still need a trigger for each TTy but not individual units. You need to add it in multiple places.

From POS2

Screenshot from 2026-03-01 10-09-55.png

@wc_sumpton may know of a better way.

Edit

Screenshot from 2026-03-01 10-03-25.png

Idk. Maybe that won't work as it Might activate all the TTys that have that attachment

wc_sumpton

@rogercooper

Try reviewing here.

@beelee is pointing you in the right direction.

Cheers...

RogerCooper

@wc_sumpton said in Transferring Unit Control:

@rogercooper

Try reviewing here.

@beelee is pointing you in the right direction.

Cheers...

Thanks. I will give that a try.

RogerCooper

I tried the code and it doesn't seem to work. I will use "removeUnits" and "placement".

wc_sumpton

@rogercooper

I don't understand the problem. In "World War II Global 1940 2nd Edition" all UK_Pacific are changed into British units, also if Japanese attack Russians then all Mongolians territories change to Russians along with their units.
Do units/infantry have "canBeGivenByTerritoryTo"?
Do territories/Spain have "changeUnitOwners"?
Do Non_Aligned have "playerAttachment" with "giveUnitControl"?
Is "Give Units By Territory" true"?
Is "changeOwnership" combat value true?

If you are more problems post some code.

Cheers...

RogerCooper

@wc_sumpton said in Transferring Unit Control:

@rogercooper

I don't understand the problem. In "World War II Global 1940 2nd Edition" all UK_Pacific are changed into British units, also if Japanese attack Russians then all Mongolians territories change to Russians along with their units.
Do units/infantry have "canBeGivenByTerritoryTo"?
Do territories/Spain have "changeUnitOwners"?
Do Non_Aligned have "playerAttachment" with "giveUnitControl"?
Is "Give Units By Territory" true"?
Is "changeOwnership" combat value true?

If you are more problems post some code.

Cheers...

I tried all of those things, and the units do not change ownership.

<attachment name="unitAttachment" attachTo="infantry" javaClass="games.strategy.triplea.attachments.UnitAttachment" type="unitType">
<option name="movement" value="1"/>
<option name="transportCost" value="1"/>
<option name="attack" value="1"/>
<option name="defense" value="2"/>
<option name="isLandTransportable" value="true"/>
<option name="artillerySupportable" value="true"/>
<option name="canBeGivenByTerritoryTo" value="Soviet_Union"/>
</attachment>

<attachment name="territoryAttachment" attachTo="Ireland" javaClass="games.strategy.triplea.attachments.TerritoryAttachment" type="territory">
<option name="production" value="1"/>
<option name="changeUnitOwners" value="Soviet_Union"/>
</attachment>

<attachment name="playerAttachment" attachTo="Non_Aligned" javaClass="games.strategy.triplea.attachments.PlayerAttachment" type="player">
  <option name="giveUnitControl" value="Soviet_Union"/>
</attachment>

<property name="Give Units By Territory" value="true" editable="false">
  <boolean/>
</property>

<attachment name="triggerAttachmentIrelandSoviet_Union" attachTo="Soviet_Union" javaClass="games.strategy.triplea.attachments.TriggerAttachment" type="player">
<option name="conditions" value="conditionAttachmentEveryTurn"/>
<option name="conditions" value="conditionAttachmentIrelandNon_Aligned"/>
<option name="players" value="Soviet_Union"/>
<option name="chance" value="80:80"/>
<option name="chanceIncrementOnFailure" value="1"/>
<option name="when" value="before:Soviet_UnionPurchase"/>
<option name="changeOwnership" value="Ireland:Non_Aligned:Soviet_Union:true"/>
<option name="changeOwnership" value="Ireland:Non_Aligned:Soviet_Union:false"/>
<option name="uses" value="1"/>
</attachment>

Ireland changes ownership, but the unit remains Non_Aligned

beelee

@rogercooper said in Transferring Unit Control:

Screenshot from 2026-03-03 16-45-33.png

these seem at odds with one another

Edit
Maybe you need to add this or the by TTy not all TTys

Screenshot from 2026-03-03 16-53-17.png

wc_sumpton

@rogercooper

Does Non_Aligned have "canTakeOverOwnedTerritory" as part of it relationshipTypeAttachment?

<option name="changeOwnership" value="Ireland:Non_Aligned:Soviet_Union:true"/>
<option name="changeOwnership" value="Ireland:Non_Aligned:Soviet_Union:false"/>

Will not work because Ireland is not Non_Aligned for the second call because it is owned by Soviet_Union.

Cheers...

RogerCooper

@wc_sumpton said in Transferring Unit Control:

@rogercooper

Does Non_Aligned have "canTakeOverOwnedTerritory" as part of it relationshipTypeAttachment?
<option name="changeOwnership" value="Ireland:Non_Aligned:Soviet_Union:true"/>
<option name="changeOwnership" value="Ireland:Non_Aligned:Soviet_Union:false"/>
Will not work because Ireland is not Non_Aligned for the second call because it is owned by Soviet_Union.

Cheers...

I tried reversing the order, but the result is the same, the territory changed ownership but not the units.

I also tried to remove and place. It doesn't work because the program assumes that the units to be removed are from the attached player. I would need to have a separate trigger for that.

wc_sumpton

@rogercooper

The order does not matter.

<option name="changeOwnership" value="Ireland:Non_Aligned:Soviet_Union:true"/>
 <!-- <option name="changeOwnership" value="Ireland:Non_Aligned:Soviet_Union:false"/>Non_Aligned no longer own Ireland, Soviet_Union does, so this will not run -->
<option name="changeOwnership" value="Ireland:any:Soviet_Union:false"/> <!-- Uses 'any' for old owner  -->

@rogercooper said in Transferring Unit Control:

Ireland changes ownership, but the unit remains Non_Aligned

I'm going to setup a test map.

Cheers...

wc_sumpton

@RogerCooper

There are two different settings. Both have unit, territory, player, and options.
canBeGivenByTerritoryTo is used to give control of a unit to another player when the unit enters a territory with changeUnitOwners unless giveUnitControlInAllTerritories is set in playerAttachment. playerAttachment should contain giveUnitControl and option "Give Units By Territory" should also be set.

But what I think you want capture.
canBeCapturedOnEnteringBy is used to gain control of the unit when a territory with captureUnitOnEnteringBy is captured. playerAttachment should contain captureUnitOnEnteringBy and option "Capture Units On Entering Territory" should also be set.

Cheers...

RogerCooper

@wc_sumpton said in Transferring Unit Control:

@rogercooper

The order does not matter.
<option name="changeOwnership" value="Ireland:Non_Aligned:Soviet_Union:true"/>
 
<option name="changeOwnership" value="Ireland:any:Soviet_Union:false"/> 
@rogercooper said in Transferring Unit Control:

Ireland changes ownership, but the unit remains Non_Aligned

I'm going to setup a test map.

Cheers...

Neither is what I want. I want to change control of the territory and units without any requirement for entry.