Rabbi Simcha Zissel Ziv Broida, aka the Alter of Kelm, around the year 1865, opened a Yeshivah with a focus on Mussar. In addition to Mussar, he
" ...also introduced general subjects such as geography, mathematics, and Russian into the Talmud Torah curriculum. These subjects were studied for three hours a day, which was unprecedented in traditional Lithuanian yeshivas. Ziv did not view general studies as a "necessary evil" but rather argued that such studies would encourage "better living" and "a better understanding of religious teachings as well." (1) (2) (From Wiki)
If I am not mistaken, the Litvish (Lithuanian) communities were typically averse to secular studies, let alone giving it a presence in a Yeshiva's curricular space. I don't have an explicit source to this besides a hint in the aforestated text and anecdotal experience with Litvish Yeshivot.
At any rate, and in light of this information, what were the reactions of the Gedolim to the Alter, if there were any?
1) Claussen, Geoffrey (2015). Sharing the Burden: Rabbi Simhah Zissel Ziv and the Path of Musar. Albany: SUNY Press. 2. Zalman Ury, The Musar Movement: A Quest for Excellence in Character Education (New York: Yeshiva University Press, 1970), 51.