Reference for Shabbat 81:2

וא"ר זירא אנא חזיתיה לר' אבהו שהניח ידיו כנגד פניו של מטה ולא ידענא אי נגע אי לא נגע פשיטא דלא נגע דתניא ר' אליעזר אומר כל האוחז באמה ומשתין כאילו מביא מבול לעולם

— Said Abaye: It was accounted as [analogous to] a marauding band. For we learnt: If a marauding band enters a town<span class="x" onmousemove="('comment',' And they may have touched or moved open barrels of wine, thus rendering them forbidden. ');">⁴</span> in peace-time, open barrels [of wine] are forbidden,<span class="x" onmousemove="('comment',' V. preceding note. ');">⁵</span> closed barrels are permitted; in war time, both are permitted, because they have no time to make nesek.<span class="x" onmousemove="('comment',' Lit., 'make a libation'. That is the reason of the interdict mentioned in n. 4, because the heathen is suspected of having dedicated the wine to his deity, ');">⁶</span>

Jastrow