It is surely significant that Rav Chaim of Volozhin, zt”l, didn’t sign on the famous cherem of the Vilna Gaon against the chassidim. Some posit that this was for technical reasons. But Rav Shalom Schwadron, zt”l, explains the real reason. “Rav Chaim of Volozhin refrained from signing due to his gratitude to a certain great rebbe. He held that just as Moshe rabbeinu did not hit the Nile due to having received a favor from it, the same held true regarding himself and the chassidim. “Once when he was just a young man he went wandering in exile, much like his rebbe the Vilna Gaon. When he arrived in Alik, a chassidic town, he went to the beis midrash and began learning—without even asking for food. The people saw that he was learning with diligence and sent him food, as was normal in those days. Shortly after he arrived in the city, he became violently ill. Rav Hirsch of Alik, zt”l, the rebbe of the city, ordered his chassidim to send for a doctor and deal with all of Rav Chaim’s needs. They paid the high doctor’s fees and procuring everything necessary for Rav Chaim’s convalescence in the town’s hospital. Even when Rav Chaim felt somewhat better, Rav Hirsch insisted that he remain in the hospital until he was entirely recovered. Because of their efforts, Rav Chaim felt that signing the cherem would be forbidden since it is a marked lack of hakaras hatov.’