tactique

The clerk had, I'm afraid, a shrew of a wife—shrill, vehement, and fluent. […] He had learned, by long experience, the best tactique under fire: he became actually taciturn; or, if he spoke, his speech was laconic and enigmatical; sometimes throwing out a proverb, and sometimes a text; and sometimes when provoked past endurance, spouting mildly a little bit of meek and venomous irony.