We must make this campaign an exceedingly active one. Only thus can a weaker country cope with a stronger; it must make up in activity what it lacks in strength. A defensive campaign can only be made successful by taking the aggressive at the proper time. Napoleon never waited for his adversary to become fully prepared, but struck him the first blow.
Ch. 22 : The Last Happy Days — Chancellorsville — 1863, p. 429 - Life and Letters of General Thomas J. Jackson (1891)