In particular i need a group of sentry/single sentry to use the ability "Guardian Shield" after a paarticuar event (it would be the best if the event is just time elapse)
If the event doesn't really matter and if you just want to use time elapse, you can easily do so. The 2 questions remaining would be, how to actually issue the order and how to reference this specific group of sentries.
It sounds to me, like you figured out, how to issue the order already, you just don't know exactly, how to reference the group of sentries, correct? If that is the case, you probably want to save those sentries in a variable of type Unit Group. If these sentries are created via trigger, this is easily done by setting a unit group variable to Last Created Unit Group, immediately after the sentries were created. If they are present on the map from the start, you can put them in the group by either picking them individually and use the Add Unit To Unit Group action or use a region and pick all sentries in that region.
If the event doesn't really matter and if you just want to use time elapse, you can easily do so. The 2 questions remaining would be, how to actually issue the order and how to reference this specific group of sentries.
It sounds to me, like you figured out, how to issue the order already, you just don't know exactly, how to reference the group of sentries, correct? If that is the case, you probably want to save those sentries in a variable of type Unit Group. If these sentries are created via trigger, this is easily done by setting a unit group variable to Last Created Unit Group, immediately after the sentries were created. If they are present on the map from the start, you can put them in the group by either picking them individually and use the Add Unit To Unit Group action or use a region and pick all sentries in that region.
Does this make any sense to you? ;)
€ also, what he said.