All 6 Uses

forthwith
in
The Odyssey, by Homer - (translated by: Butler)
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So saying she bound on her glittering golden sandals, imperishable, with which she can fly like the wind over land or sea; she grasped the redoubtable bronze-shod spear, so stout and sturdy and strong, wherewith she quells the ranks of heroes who have displeased her, and down she darted from the topmost summits of Olympus, whereon forthwith she was in Ithaca, at the gateway of Ulysses' house, disguised as a visitor, Mentes, chief of the Taphians, and she held a bronze spear in her hand.†
Book 1

forthwith = immediately
(endnote 3) Forthwith men servants poured water over their hands, maids went round with the bread-baskets, pages filled the mixing-bowls with wine and water, and they laid their hands upon the good things that were before them†
Book 1
Forthwith he bound on his glittering golden sandals with which he could fly like the wind over land and sea.†
Book 5 *
She at once called her husband Antiphates from the place of assembly, and forthwith he set about killing my men.†
Book 10
Thus did he speak, and his words pleased them well, so they rose forthwith and went to the house of Ulysses, where they took their accustomed seats.†
Book 16
Jove heard his prayer and forthwith thundered high up among the clouds from the splendour of Olympus, and Ulysses was glad when he heard it.†
Book 20

Definitions:

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