“Σπονδή, drink-offering, …pl., σπονδαί a solemn treaty or truce (because solemn drink-offerings were made on concluding them,)” Perseus Greek Word Study Tool; Middle Liddell
I don’t think the bolded sentence above is correct. I can find no evidence that libations were part of the truce ritual. References listed by Liddell and Perseus are;
Nestor is speaking in Iliad 2 to the gathered Hellenic chieftains, “What then is to be the end of our compacts and our oaths?  Nay, into the fire let us cast all counsels and plans of warriors, the drink-offerings of unmixed wine, and the hand-clasps wherein we put our trust.” He appears to be speaking about compacts and oaths among themselves, not a truce with the Trojans.
Thucydides 1.35 “If it be urged that your reception of us will be a breach of the treaty existing between you and Lacedaemon,” No mention of libations in conjunction with the treaty (truce)
Aristophanes’ “Knights” mentions drinking, not drink-offerings and not connected to the single instance of “truce”
Neither text mentions libations and treaty making.
· τυχεῖν Xen.; (I couldn’t find.)
No mention of libations in coordination with the treaty
Neither reference mentions libations and truce
No mention of libations in coordination with the truce
None of Liddell’s references mention libations as part of a truce ritual. I can recall neither truces nor treaties in Greek myth showing drink-offerings being part of treaties. Liddle ll is wrong about libation(s).