It is, thus, the management 's case that under the .circumstances mentioned above the company was compelled to declare a lock out from the first shift of April 23, 1975: It may be appropriate to set out the lock out notice dated April 23, 1975: "We hereby give notice to all concerned that a lock out is declared with effect from the begin ning of l st shift commencing at 7.00 a.m. on 23 4 1975 in our mills for the following or any of the reasons given below: (a) On or about 4.30 p.m. on 21 4 1975 a section of the workmen forcibly entered into the mill Guest House No. 2 and trespassed into the room in which Shri L. Grover, the Establishment Officer of the mills resides, dragged him out of the room and took him to the Administrative Office of the mills and kept him there under restraint and illegal confinement for about 24 hours.