seek = search for. Hebrew. bakkesh, especially to seek for blood or life. Compare 2Sa_4:11, "require".
went out against them.2Sa_5:17 says "went down to the hold". But this was earlier; for the later command was "thou shalt bestir thyself", which corresponds with the command "Go up" (1Ch_14:10) here, as well as with "thou shalt bestir thyself" of 2Sa_5:24.