4.3 “pursuant to an assignment” - contract of carriage?
Usually, the sub-carrier performs on the basis of a contract with the contracting carrier, which may be a lengthy, complicated document in writing, e.g. a time charter party. The assignment may take the form of a request, which is accepted by actually carrying out the transport.
Acceptance of the assignment is, in most instances, a contractual promise of carriage on the part of a sub-carrier as against the contracting carrier. He is also, by the rule of law, a carrier as against the cargo owner, and thus Chapter 13 applies.