take temporary possession of a security by legal authority
The bureau had the authority to give forty acres plots of abandoned and confiscated land to to Freedman and Southern white refugees who had been loyal to the Union.
providing nurture though not related by blood or legal ties
Some argued for a "hands off" approach to the Freedmen, which which they claimed would foster independence, while others insisted that it would be unfair to abandon the Freedmen to their former masters without the economic base they would need to become independent citizens.
The omission of land confiscation from the Reconstruction Acts of 1867 was a severe blow to the Radical Republicans, and to their plans to aid the Freedmen and break the Southern ruling class.
the act of passing from one state or place to the next
Congress created the Freedmen's bureau as a temporary compromise measure which would aid Freedmen and women in the immediate transition to freedom but prevent any long-term dependency.
of or relating to production and management of wealth
Some argued for a "hands off" approach to the Freedmen, which which they claimed would foster independence, while others insisted that it would be unfair to abandon the Freedmen to their former masters without the economic base they would need to become independent citizens.
It seems likely that Sherman's intention was simply to relieve his army of the thousands of Freedmen and women who had been following it since Sherman's invasion of Georgia.