His tactical blunder was trying to save money by building with mostly donated labor.
Christianity Today
I think that in revealing their hand so soon, they've made a tactical blunder.
Times, Sunday Times
He could yet salvage the strategic goal from tactical blunder.
Times, Sunday Times
It proved to be a catastrophic tactical blunder.
The Times Literary Supplement
He has been criticised for political naivety, for failing to explain his policy decisions, and for tactical blunders that have damaged his presidency.
Times, Sunday Times