What does this "struck" mean?

mo3-27
ex) Igor Stravinsky wrote the score for his ballet
Apollo Musagetes in six parts for a string orchestra. The first time it was performed, there were sixteen first and fourteen second violins, ten violas, four first and four second cellos, and six double basses. Stravinsky was horrified: “I was struck by both the confusion of sound and the excessive resonance.... Everything seemed drowned in indistinct buzzing.” He pared the orchestra down to eight first and eight second violins, six violas, four first and four second cellos, and four double basses, and “everything became sharp and clear.” As Stravinsky found out the hard way, scaling is a major issue in orchestrating music.