unforeseen attack

Skroupa: With an unforeseen attack, how can executives trust that their response plan will even work?

‘If,’ he says, ‘my misfortune must begin by an unforeseen attack by a greedy legatee, for a just debt, for an act founded on the reciprocal esteem and the equity of the contracting parties, accord me for adversary, a man, miserly, unjust and known so to be’—and he designates the Comte de la Blache so vividly that every one has named him already.

The main thing was to find out whether there was any entrance to the house which could allow of an unforeseen attack.

The shepherds, terror-struck by this unforeseen attack, had not even thought of the slightest resistance, but had fled in disorder, carrying with them only that which they happened to lay their hands upon at the moment. 

His face presented a curious stolidity of look, as if a protection against some unforeseen attack.