A controller for controlling a chopper arrangement of an agricultural harvester, the controller comprising: an input configured to receive: first sensor data indicative of an intensity of chopping performed on crop material by the chopper arrangement; and, second sensor data indicative of a power consumption of the chopper arrangement; a processor configured to determine an actuator setting for at least one chopper arrangement actuator of the agricultural harvester in dependence on the received first sensor data indicative of the intensity of chopping and the received second sensor data indicative of the power consumption; and, an output configured to send an actuator control signal to the at least one chopper arrangement actuator to control the at least one chopper arrangement actuator to operate in accordance with the associated determined actuator setting, wherein the determined actuator setting includes: an amount of insertion of at least one bank of counter knives of the chopper arrangement relative to a plurality of rotatable knife rows of the chopper arrangement; and, an angle of insertion of the at least one bank of counter knives relative to the plurality of rotatable knife rows, characterized in that the controller is configured to send one or more control signals to independently control the amount of insertion and the angle of insertion of the at least one bank of counter knives in accordance with the settings determined based on the current intensity of chopping and current power consumption. an input configured to receive: first sensor data indicative of an intensity of chopping performed on crop material by the chopper arrangement; and, second sensor data indicative of a power consumption of the chopper arrangement; first sensor data indicative of an intensity of chopping performed on crop material by the chopper arrangement; and, second sensor data indicative of a power consumption of the chopper arrangement; a processor configured to determine an actuator setting for at least one chopper arrangement actuator of the agricultural harvester in dependence on the received first sensor data indicative of the intensity of chopping and the received second sensor data indicative of the power consumption; and, an output configured to send an actuator control signal to the at least one chopper arrangement actuator to control the at least one chopper arrangement actuator to operate in accordance with the associated determined actuator setting, wherein the determined actuator setting includes: an amount of insertion of at least one bank of counter knives of the chopper arrangement relative to a plurality of rotatable knife rows of the chopper arrangement; and, an angle of insertion of the at least one bank of counter knives relative to the plurality of rotatable knife rows, an amount of insertion of at least one bank of counter knives of the chopper arrangement relative to a plurality of rotatable knife rows of the chopper arrangement; and, an angle of insertion of the at least one bank of counter knives relative to the plurality of rotatable knife rows, characterized in that the controller is configured to send one or more control signals to independently control the amount of insertion and the angle of insertion of the at least one bank of counter knives in accordance with the settings determined based on the current intensity of chopping and current power consumption.