All 5 Uses

forthwith
in
The Swiss Family Robinson
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'Ernest, although rather treating Jack's manufacture with ridicule, proposed a sensible-enough plan, which Jack forthwith put in execution.†
Chpt 3 *

forthwith = immediately
This name met with general approbation, and was forthwith fixed upon.†
Chpt 4
This being all I could do without a greater variety of tools, I determined to complete my work in a more convenient situation, and forthwith dispatched Fritz and Jack with orders to bring the sledge (which now ran on wheels taken from gun-carriages) that the canoe might be transported direct to the vicinity of the harbour at Tentholm.†
Chpt 9
Well done, Ernest!' resounded on all sides, and taking out a large red pencil I used for marking wood, the lines were forthwith inscribed on a great flat stone, being, as I told the boy, the very best poetry that had ever been written on our coast.†
Chpt 11
As our little tent was unsuited to a long residence of this sort, I adopted Fritz's idea of a Kamschatkan dwelling and, to his great delight, forthwith carried it out.†
Chpt 15

Definitions:

(1) (forthwith)
immediately -- (most typically seen in legal documents, formal use, or classic literature)
(2) (meaning too rare to warrant focus)