They had seriously miscalculated, thinking the locals would be at a much higher level of technology by the time of their arrival.
Robyn Ballantyne realized within the first day's march that she had seriously miscalculated her father's strength and resilience when she made the decision to try for the coast.
The problem for the British was that they had seriously miscalculated their own positions.
These guys had seriously miscalculated the demographics, too.
And that heart told the Ghin that his opponent had seriously miscalculated.
The gods had been with him, for he had seriously miscalculated.
The size of the explosive charge had been seriously miscalculated, and the ship sank quickly.
Now that the fireworks were over, it was dawning on him that he must have seriously miscalculated.
Barham had seriously miscalculated the strength of the Brest fleet, which had been uninvolved in the campaign of 1805 and was therefore at full strength.