Invisible servants act as some sort of force that can perform simple tasks.

Is it possible to use them to aid in battle while doing so?

For example:

• Have several servants told to carry heavy large metal plates around some character. (Basically creating a barrier that would protect the character behind it.)

• Have servant carry some alchemy substance and instruct it to drop it on the ground in the middle of the enemies.

I think there are many more abuses of "carry and drop" commands. But are they legal?

Unseen Servants act as some sort of force that can perform simple tasks.

Is it possible to use them to aid in battle while doing so?

For example:

• Have several servants told to carry heavy large metal plates around some character. (Basically creating a barrier that would protect the character behind it.)

• Have a servant carry some alchemical substance and instruct it to drop it on the ground in the middle of the enemies.

I think there are many more abuses of "carry and drop" commands. But are they legal?