The last stretch of the Tordera is a wide sandy bed subject to seasonal flow.

[1] In the last week of January 1939 the 77th Division of the Spanish Republican Army, together with the 242nd Mixed Brigade —which had not been ascribed to any division—,[2] tried to establish a planned defensive line along the course of the Tordera River in order to halt the massive rebel offensive.

The units took position along the course of the river east of the Montseny Massif on 27 January.

[3] The effort, however, proved futile and in practice it became impossible for the Republican forces to put up any meaningful resistance, especially since the young, inexperienced and ill-equipped 242rd Mixed Brigade —posted at the lower course of the river— was not prepared for the battle and quickly fell into disarray and was overrun.

In the face of the powerful and steady enemy advance the 77th Division abandoned the defensive line along the Tordera and withdrew to the town of Vic, which it lost on 1 February.